Wearing tool for breathing mask, and breathing mask

ABSTRACT

For reducing a discomfort feeling brought by wearing a breathing mask, a wearing tool for the breathing mask which covers nostrils of a user and supplies gas for breathing to the nostrils comprises a pair of connecting members each of which has a longitudinal shape and has a first end portion which is connected to the breathing mask, and a pair of fixing members each of which is connected to a second end portion of the fixing member and is plugged in the tragus of the user. Hence a discomfort feeling due to restraining around the head of the user can be reduced.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Divisional application of U.S. patent applicationSer. No. 13/130,709, filed May 23, 2011, which is a National Stage ofInternational Application No. PCT/JP2009/006376 filed Nov. 26, 2009,claiming priority based on Japanese Patent Application No. 2008-302362,filed Nov. 27, 2008, the contents of all of which are incorporatedherein by reference in their entirety.

FIELD OF THE INVENTION

The present invention relates to a breathing mask which covers a user'snostrils and supplies pressurized gas for breathing to the nostrils, andto a wearing tool for the breathing mask.

BACKGROUND OF THE INVENTION

As a treatment method for sleep apnea syndrome, such that an airway isobstructed and becomes apnea during sleep, CPAP (Continuous PositiveAirway Pressure) treatment is known, in which gas for breathingpressurized in the range from 392 to 1961 Pa is continuously supplied tothe nostrils of a patient when sleeping, so that the airway of thepatient is expanded, and thus the patient breathing is assisted.

For CPAP treatment, a breathing gas supply apparatus is used, which hasa function for generating gas for breathing by pressurizing the air. Gasfor breathing generated by the breathing gas supply apparatus issupplied through a flexible hose to a breathing mask. The breathingmask, as an example is described in Patent Document 1, is configured tocover the nostrils of the patient who uses the breathing mask(hereinafter, the “user”). And the user is supplied with gas forbreathing by wearing the breathing mask when sleeping.

To achieve the intended effect of therapy by CPAP treatment, it isimportant to ensure that gas for breathing does not leak out of thebreathing mask. Therefore, it is required that the breathing mask be inclose contact with the environs of the nostrils and fixed in thatcondition for a long term. To meet such a requirement, various methodshave been proposed. For example, in Patent Document 1 and PatentDocument 2, a headgear-style wearing tool is described. Theheadgear-style wearing tool fixes the breathing mask by straps fastenaround the head of the user. A cold mask-style wearing tool described inPatent Document 3 fixes the breathing mask by loop-shape elastic bandslatching around ears of the user. Further, in Patent Document 2, thereis a description of a breathing mask which is configured so that anangle of the above mentioned wearing tool attached to the breathing maskis adjustable. This breathing mask has an angle adjustment mechanismwhich is configured so that a connecting portion with the wearing toolis configured to be rotatable, and an angle of the breathing maskrelative to the environs of the nostrils of the user is adjusted, andthus the degree of closeness of contact of the breathing mask isenhanced.

In addition, if humidity contained in gas for breathing or the breath ofthe user is condensates on the inner walls of the breathing mask andwater drops drip onto the face of the user lying on the back, the useris needlessly wakened. Therefore, methods to prevent this have beenproposed. For example, a breathing mask described in Patent Document 4has the outer shell (frame) which is dual structured, and a heatinsulating air layer between the inner and the outer walls of thebreathing mask. By this means, the temperature of the inner walls ismaintained higher than the temperature of the outer walls, and thecondensation is suppressed.

Further, when the user lies on the side with the breathing mask worn, ifthe flexible hose is crushed by his body, supply of gas for breathing isinhibited and the treatment is interfered. To prevent this, for example,there is a description of a breathing mask in Patent Document 5, whichhas on the frame a rotatable L-shape tube to be connected with theflexible hose. By this breathing mask, the user can direct the flexiblehose to the direction such that the concern of the flexible hose beingcrushed under the user's body who lies on the side is smaller, and thuscrushing of the flexible hose can be prevented.

PRIOR TECHNICAL DOCUMENT

-   Patent Document 1: Japanese Patent Application Laid-Open Publication    No. H09-10311-   Patent Document 2: Japanese Patent Application Laid-Open Publication    No. 2004-572-   Patent Document 3: Japanese Patent Application Laid-Open Publication    No. 2004-209061-   Patent Document 4: Japanese Patent Application Laid-Open Publication    No. 2008-119239-   Patent Document 5: Japanese Patent Application Laid-Open Publication    No. 2004-570

SUMMARY OF THE INVENTION

However, the conventional arts described above have the following typesof problems. Firstly, as for the headgear-style wearing tool describedin Patent Document 1 and Patent Document 2, due to the straps pressingaround the head of the user, there is the concern that a discomfortfeeling such as a feeling of restraint or a feeling of pressure mayoccur. Secondly, as for the cold mask-style wearing tool described inPatent Document 3, due to the elastic bands biting the bases of the earsof the user, there is the concern that a discomfort feeling or a painmay occur. These discomfort feeling or pain may cause poor quality ofsleep. This can cause a problem with regard to the object of CPAPtreatment, that is, suppressing unnecessary and harmful awakening andraising the quality of sleep.

As for a wearing tool such as straps, when the user changes his bodyposition while sleeping and the breathing mask or the hose are caughtand pulled by the user's body or by a bedcloth, there is a case that aforce is placed to twist the strap in the width direction. Then thestraps are twisted, and there is the concern that the breathing mask isdisplaced from the environs of the nostril. This causes problems fromthe standpoints of therapeutic effects.

There also is the concern that the angle adjustment mechanism foradjusting the angle of the breathing mask and the wearing tool describedin Patent Document 2 underlies and presses user's face when the userlies on the side, which results a discomfort feeling. Additionally, ifan attempt is made to adjust the angle of the breathing mask relative tothe height of the nasal bridge or the direction of the nostrils of theuser while the breathing mask is worn, gaps are likely to occur at theenvirons of the nostrils, and thus there is the concern that it becomesnecessary to wear the wearing tool again after the angle adjustment.This causes problems from the standpoints of user convenience.

Further, as for the breathing mask described in Patent Document 4, thereis a problem of increase of costs for manufacturing the dual structuredframe. For example, integral molding by a method with high difficultysuch as blow molding leads to increase of costs. Even if a method isemployed to mold the inner and the outer walls separately and to combinethem, increase in the number of components and increase in the number ofassembly processes entail.

And, as for the breathing mask described in Patent Document 5,manufacturing the frame and the L shaped hose separately and assemblingthem leads to a problem of increase of costs due to increased number ofcomponents and assembly steps. There also is the concern that theL-shape tube, because of being rotatable, may touch the forehead or lipsof the user and gives the user a discomfort feeling.

Therefore, the object of the present invention is to provide a breathingmask and a wearing tool for it, which can reduce a discomfort feelingbrought by wearing.

Another object of the present invention is to provide a wearing toolwhich can prevent displacement of the breathing mask.

Further object of the present invention is to provide a wearing toolwhich enables adjusting an angle of the breathing mask relative to theuser's nostrils, and which can be worn easily.

Further object of the present invention is to provide at low cost abreathing mask which can suppress the condensation.

Further object of the present invention is to provide at low cost abreathing mask which can prevent interference with the supply of gas forbreathing.

In order to achieve the above object, the first aspect of the presentinvention is a wearing tool for a breathing mask which covers nostrilsof a user and supplies gas for breathing to the nostrils comprising apair of connecting members each of which has a longitudinal shape, andhas a first end portion which is connected to the breathing mask, and apair of fixing members each of which is connected to a second endportion of the connecting member, and is plugged in a tragus of theuser.

The second aspect of the present invention is a wearing tool for abreathing mask which supplies a user with gas for breathing comprising apair of connecting members each of which has a longitudinal shape andhas a first end portion which is connected to the breathing mask, and aframe portion which is connected to a second end portion of theconnecting member and is placed around an ear flap of the user; theframe portion has a biasing portion which abuts and biases the base ofthe ear of the user.

The third aspect of the present invention is a wearing tool for abreathing mask which covers nostrils of a user and supplies pressurizedgas for breathing to the nostrils comprising a pair of connectingmembers each of which has a longitudinal shape and has a first endportion, which is connected to the breathing mask, and which fixes thebreathing mask at the environs of the nostrils of the user, and asupporting member which extends in the longitudinal direction of theconnecting member, and has greater rigidity than that of the connectingmember; the supporting member has a first width in the region close tothe first end portion and a second width, which is greater than thefirst width, in the other region.

The fourth aspect of the present invention is a breathing mask which hasa wearing tool comprising a pair of connecting members each of which hasa longitudinal shape and has a first end portion which is connected tothe breathing mask, and a pair of supporting members which are providedon the pair of connecting members and have greater rigidity than that ofthe pair of connecting members; each of the pair of the supportingmembers further comprises a first plate-shape member which is fixed atthe breathing mask and a second-plate shape member which is fixed at theconnecting member, and the first plate-shape member and the secondplate-shape member are rotatable around a rotation axis in a positionwhich is used as a pivot of an angle adjustment of the breathing maskwhen the angle adjustment of the breathing mask is performed.

The fifth aspect of the present invention is a breathing mask whichcovers the nostrils of the user and supplies gas for breathing to thenostrils comprising a first member which abuts the face of a user andcovers the nostrils and comprises a first inhaling port which takes ingas for breathing and/or a first exhaling port which discharges breath,and a second member having a rigidity greater than that of the firstmember, which covers at least a portion of the first member andcomprises a second inhaling port connected to a means for transport ofthe gas for breathing and which mates with the first inhaling portportion and/or a second exhaling port which mates with the firstexhaling port portion and which is connected to the outside; a cavity ispresent between the first member and the second member, or the firstmember has water repellent properties.

The sixth aspect of the present invention is a breathing mask whichcovers the nostrils of a user and supplies gas for breathing to thenostrils comprising a first member which abuts the face of the user andcovers the nostrils, and a second member, having greater rigidity thanthat of the first member, which is connected with the first member byconnecting, at a prescribed position, with a transporting means of thegas for breathing; portions of the first member and the second memberfor connecting each other have 180 degree rotational symmetry shapes.

According to the first and the second aspect of the present invention,the breathing mask can be fixed at the environs of the nostrils of theuser, and the discomfort feeling brought by wearing can be reduced.

According to the third aspect of the present invention, displacement ofthe breathing mask while used can be prevented, and the discomfortfeeling brought by wearing can be reduced.

According to the fourth aspect of the present invention, the wearingtool for the breathing mask is provided which enables adjustmentaccording to the structure of the nose of the user, and which can beeasily worn.

According to the fifth aspect of the present invention, the breathingmask is provided at low cost which can suppress the condensation.

According to the sixth aspect of the present invention, the breathingmask is provided at low cost which can prevent interference with thesupply of gas for breathing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for explaining the overall configuration of CPAPsystem to which the breathing mask and the wearing tool for it relatedto the present invention are applied.

FIGS. 2A and 2B are drawings for explaining a using status of a wearingtool in the first embodiment.

FIG. 3 is a drawing for explaining a using status of the plug 12 pluggedin a dimple inside the tragus.

FIG. 4A through FIG. 4D are drawings for explaining the configuration ofthe wearing tool 14.

FIG. 5A through FIG. 5D are drawings for explaining the first practicalexample of the plug 12 as the fixing member.

FIG. 6A through FIG. 6G are drawings for explaining a variation of theinserting portion 12 d.

FIG. 7A and FIG. 7B are drawings for explaining the second practicalexample of the plug 12 as the fixing member.

FIG. 8 is a drawing for showing a using status of the second practicalexample.

FIG. 9A through FIG. 9D are drawings for explaining a variation of thesecond practical example.

FIG. 10A through FIG. 10C are drawings for explaining a connectingstructure of the plug 12 and the connecting portion 12 b.

FIG. 11A through FIG. 11E are drawings for explaining the thirdpractical example of the plug 12 as the fixing member.

FIG. 12A through FIG. 12C are drawings for explaining a variation of theplug 12 and the ear hooking portion 13.

FIG. 13 is a drawing for explaining the second embodiment of the wearingtool 14.

FIG. 14 is a drawing for explaining a using status of the wearing tool14.

FIG. 15A through FIG. 15C are drawings for explaining examples of theshape of the biasing portion 130 b.

FIG. 16A though FIG. 16F are drawings for explaining a variation of thesecond embodiment.

FIG. 17A through FIG. 17C are drawings for explaining configuration ofthe supporting member.

FIG. 18A through FIG. 18D are drawings for explaining a variation of thepanel 16.

FIG. 19A and FIG. 19B are drawings for explaining the panel 16 as thesupporting member.

FIG. 20 is a drawing for explaining function of the fourth embodiment.

FIG. 21A through FIG. 21C are drawings for explaining a variation ofplate-shape members 160 a and 160 b.

FIG. 22A and FIG. 22B are drawings for explaining an example of thepanel 16 of the third or the fourth embodiment being applied toconventional headgear-style wearing tool.

FIG. 23 is a drawing for explaining an example of combination of thewearing tool 14 of the first and the third embodiments.

FIG. 24 is a drawing for explaining the configuration of a breathingmask of the prior art.

FIG. 25A through FIG. 25C are drawings for explaining the structure ofthe frame in this embodiment.

FIG. 26A and FIG. 26B are drawings for showing enlarged views ofdifferent portions of the frame.

FIG. 27A and FIG. 27B are drawings for explaining the structure of thecushion.

FIG. 28A and FIG. 28B are drawings for showing cross-sections of thecushion 30.

FIG. 29A and FIG. 29B are drawings for showing cross-sectional views ofthe state in which the frame 20 and cushion 30 are mated.

FIG. 30 is a drawing for showing an example of the configuration of aframe 20 and cushion 30 having separate inhaling ports and exhalingports.

FIG. 31A through FIG. 31D are drawings for explaining examples of theshapes of the mating portions of the frame 20 and cushion 30.

FIG. 32 is a drawing for explaining an example of a conventionalbreathing mask to which the frame 20 and cushion 30 are applied.

FIG. 33A through FIG. 33E are drawings for explaining a practicalexample relating to the combination of the mating portion 27 of theframe 20 and the mating portion 16 a of the panel 16.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention are explained below with referenceto accompanying drawings. The technical scope of the present invention,however, is not limited to these embodiments, and includes the subjectmatter set forth in the claims as well as equivalents thereof.

FIG. 1 is a drawing for explaining the overall configuration of CPAPsystem to which the breathing mask and the wearing tool for it relatedto the present invention are applied.

This CPAP system, through pressurizing gas for breathing according tothe prescribed-pressure by a medical doctor and sending the gas forbreathing to the airway of a sleep apnea syndrome patient (the user) whois receiving CPAP treatment, expands the user's airway so as to assistthe user to breathe.

The CPAP system comprises a breathing gas supply apparatus 2 whichsupplies gas for breathing by pressurizing the air according to aninputted pressure prescribed by a medical doctor, flexible hoses 4 a and4 b which carry gas for breathing, and a breathing mask 8 which is wornby the user when sleeping. Here, a humidifier 6 is also shown, whichhumidifies gas for breathing to a preliminarily set degree of humidityand supplies it to the breathing mask 8.

Breathing gas supply apparatus 2 starts its operation when powered on,and sends pressurized gas for breathing firstly to humidifier 6 throughthe flexible hose 4 a. Gas for breathing humidified by the humidifier 6is sent to the breathing mask 8 through the flexible hose 4 b. Thebreathing mask 8 is fixed in close contact with the environs of thenostrils and covering it by a wearing tool as described later, and sendsgas for breathing through the nostrils into the airway of the user.

The breathing gas supply apparatus 2, for example, operates infixed-pressure mode in which the air is pressurized to a certainpressure in the range from 392 Pa to 1961 Pa, or in dynamic-pressuremode in which the pressure of gas for breathing is adjusted according tobreathing conditions of the user sensed by a pressure sensor or a flowsensor installed in the apparatus. Humidifier 6 is used to preventexcessive drying of the mucous membranes within the nostrils or thelarynx, however, it can be omitted according to the instruction of themedical doctor or preference of the user.

Hereinafter, embodiments of the wearing tool for the breathing mask andof the breathing mask are explained. Embodiments described hereinaftercan be practiced solely or in combination, or in another combination.

[1] First Embodiment of Wearing Tool

FIGS. 2A and 2B are drawings for explaining a using status of a wearingtool in the first embodiment. Here, a front view and a side view areshown when the user wears the breathing mask 8 by a wearing tool 14. Thewearing tools 14 are connected to the both sides of the breathing mask 8which is connected to the flexible hose 4 b and covers the nostril. Thewearing tool 14 comprises straps 10 as the pair of the longitudinalconnecting members each of which is connected by one end portion toeither sides of the breathing mask 8, and the plugs 12 as the pair offixing members each of which is connected to the other end portion ofstraps 10. In the following explanations, the lateral direction, theanteroposterior direction, and the vertical direction refer to each ofthe corresponding directions from the user who wears the wearing tooland the breathing mask.

Here, names of parts of the ear together with a using status of the plug12 are shown in FIG. 3. The plug 12 is plugged into a dimple around thetragus of the user as shown by a dotted line.

Here, by configuring the strap 10 to be in properly adjusted length, atensional force (arrow T1) acts in the longitudinal direction of thestrap 10 when the user wears the breathing mask 8. Then, resisting sucha tensional force, the plug 12 latches at inside the tragus. In thisway, the wearing tool 14 fixes the breathing mask 8 in close contactwith the environs of the nostrils of the user.

The wearing tool 14 which is configured as above does not restrain andcompress the head of the user, as with a headgear-style wearing tool.Therefore, an advantageous result is achieved, such that a physical painand a discomfort feeling such as a feeling of restraint or a feeling ofpressure are reduced.

Also region of contact with the head of the user has smaller area thanthat of the headgear-style wearing tool, and thus a discomfort feelingcaused by sweat and humidity in the contact region with the wearing toolis reduced. Inconvenience by untidy hair also can be prevented.

The wearing tool 14 is not brought into contact with a pillow when userlies on the back, therefore, displacement of the breathing mask 8,caused by shift of relative position of the wearing tool to the user'shead due to a friction with the pillow when user rolls over, can beprevented. If the breathing mask 8 is displaced, close contact with theenvirons of the user's nostrils is lost, and gas for breathing leaksfrom gaps which occur between the breathing mask 8 and user's face. Thiscauses problems such as not only poor therapeutic performance by failurein supplying gas for breathing of preliminary designated amount, butalso unnecessary and harmful awakening of the user caused by gas forbreathing blown onto the user's face. This embodiment, however, canavoid such problems.

The wearing tool 14 in this embodiment also can reduce a pain given tothe user, compared with the cold mask-style wearing tool which hasloop-shape elastic members such as elastic bands or the like to latcharound user's ear. The reason is that the cold mask-style wearing toolgives a pain to the user by biting into the environs of the ear whichare pain sensitive and delicate region, but the inside of the tragus ismore robustly structured and has lower pain threshold compared to theenvirons of the ear. Thus, the wearing tool 14 of this embodiment canreduce user's pain.

Further, in this embodiment, such an action of latching the wearing toolaround the back of the head as is required in the case of headgear-stylewearing tool is unnecessary, therefore, even a user who has impairmentin the shoulder with limited moving range can easily wear the breathingmask 8.

FIG. 4 is a drawing for explaining the configuration of the wearing tool14. FIG. 4A shows the entire configuration of, for example, right-sidewearing tool 14. The strap 10, in one example, consists of inelasticfabric. As explained above, one end portion of the strap 10 is connectedto a side of the breathing mask 8, and the other end portion isconnected to the plug 12. Here, the strap 10 can be fixed to the side ofthe breathing mask 8 by a connecting means such as stitching, resinadhesion, or the like. In one preferable embodiment, as shown in FIG.4A, the strap 10 and the breathing mask 8 are configured so thatattachment and removal are enabled by the mating portion 10 a such as abuckle and a hook which can mate with each other and provided on the endportion of the strap 10 and the side of the breathing mask 8. Thereby,the strap 10 and the breathing mask 8 can be disassembled and cleaned,so that the strap 10 and the breathing mask 8 can be maintained insanitary manner.

On the other hand, as an example of a connecting means of the strap 10and the plug 12, stitching, resin adhesion or the like can be used. Inone preferable embodiment, as shown in FIG. 4A, planate fastener 10 bsuch as Velcro® or Magic Tape® are provided on the tip end of the strap10, which goes through an opening of the buckle 12 a and folds back sothat the planate fastener 10 b latches on the surface of the strap 10.Thereby, the overall length of the strap 10 can be adjustable.

Alternatively, various fastening means can be used other than theplanate fastener 10 b. For example, a configuration is possible, inwhich equally spaced holes are provided at either of the tip end of thestrap 10 or opposing middle portion of the strap 10, and a hook or abutton to be snapped in one of the holes is also provided on the other.Or, a tine can be provided on the side of the buckle 12 to latch on thefabric of the surface of the strap 10.

In a further preferable embodiment, one portion of the strap 10 such asa portion 10 c which goes through the buckle 12 a and folds back can beconfigured by other material such as elastic strap or the like. Thereby,excessive elasticity overall can be avoided, and at the same time,adjustability of the length of the strap 10 is enhanced.

In this way, the length of the strap 10 can be adjusted according to thesize of the face of the user. And, as shown in FIGS. 2A and 2B and FIG.3, by latching of the plug 12 at inside the tragus against the tensionalforce which acts in the longitudinal direction of the strap 10, thebreathing mask 8 can be fixed in close contact with the environs of thenostrils of the user.

Below, the plug 12 will be explained. The plug 12 which is plugged inthe dimple inside the tragus is connected to the buckle 12 a by aconnecting portion 12 b which is exposed on the outside of the tragus.Preferably, the plug 12 and the connecting portion 12 b are placedsubstantially on the centerline C of the strap 10 shown by adashed-dotted line. Thus, the force to hook of the plug of 12 on thetragus can resist, without being dispersed, the tensional force actingin the longitudinal direction of the strap 10. By this means, droppingoff of the plug 12 can be prevented.

A cross-sectional view of the plug 12 on a dashed-dotted line C is shownin FIG. 4B. The plug 12 which is plugged in the dimple inside the tragushas substantially semispherical shape. Further, it is preferable that anedge E1 which demarks the bottom plane and the lateral side is roundedso as to soften the contact and reduce a pain of the user when the plug12 is worn.

Also, by making a diameter R1 of the plug 12 greater than the diameterR2 of the portion for connecting the plug 12 and the connecting portion12 b, the area of contact of the plug 12 with the dimple inside thetragus, when the plug 12 is plugged in, can be increased, and thus theforce to hook can be enhanced. Also, it is preferable that the height H1of the plug 12 is such that the plug 12 fits in the dimple inside thetragus, and that the height of a portion of the connecting portion 12 bwhich is exposed out the tragus, that is, the diameter R3 is small. Bymaking the diameter R3 small, even when the user lies on the side andthe connecting portion 12 b presses the environs of the tragus due tothe contact with pillow, a feeling of pressure can be reduced. As forpreferable examples of sizes, the diameter R1 lies in the range from 13to 17 millimeters, the height H1 lies in the range from 5 to 10millimeters, and the diameter R3 of connecting portion 12 b is equal toor less than 8 millimeters. However, this embodiment is not meant to belimited within these ranges of numbers.

The plug 12 can be integrally molded by a single kind of material, orcan be formed by using combination of a plurality of materials. In caseof integral molding from a single kind of material, a material withmoderate elasticity, robustness, and/or biocompatibility is preferablyused. Such a material can be, for example, silicone rubber, naturalrubber, polystyrene rubber, polyisoprene rubber, polyurethane elastomer,urethane or another pressure relieving material. On the other hand, incase of forming the plug 12 by a plurality of materials, as an exampleshown in a cross-sectional view in FIG. 4C, the connecting portion 12 band inner portion of the plug 12 shown by hatching can be formed from amaterial M1 such as nylon or the like, and the outer portion is coveredby a material M2 such as urethane or another pressure relievingmaterial, or silicone rubber or the like. Thereby, frictional force whenplugged inside the tragus can be enhanced, and dropping off of the plug12 can be prevented. And at the same time, a contact sensation can besoftened and the user's pain can be reduced.

Another preferable embodiment of the plug 12 is explained by referencingFIG. 3 again and by using FIG. 4A. The plug 12 has a cutout as anacoustic hole 12 in the position corresponding to the ear canal, whenplugged in the dimple inside the tragus. Thereby, passage for sounds ofthe outer environment and a beep sound of an alarm clock can be secured.Thus, the user, while sleeping, can hear the sounds of the outerenvironment in emergency and the beep sound of the alarm clock,therefore, safety of the user is secured and convenience for the user isenhanced. For securing the acoustic passage, the plug 12 can also have athrough hole in place of the cutout.

Further, for securing the sanitation of the wearing tool 14, it ispreferable to disassemble and clean the wearing tool 14. However, inthat case, the user is required by himself to reassemble the wearingtool 14. Therefore, to assist precise and efficient reassemble, the plug12 is provided with a discriminating means for the left and right sides.For example, as shown in an enlarged view of the plug 12 in FIG. 4D, theplug 12, herewith on the connecting portion 12 b provided on the plug12, has a protrusion 12 p. Thereby, discrimination between the left andright sides is possible according to presence or absence of protrusion12 p, or by the number thereof. Alternately, instead of a protrusion,characters, symbols, or figures can be used as the discriminating meansfor the left and right sides.

First Practical Example of Fixing Member

FIG. 5 is a drawing for explaining the first practical example of theplug 12 as the fixing member. FIG. 5A through FIG. 5D show lateral viewsof the plug 12. In an example shown by FIG. 5A, the plug 12 further hasan inserting portion 12 d which is to be inserted in the ear canal. Theinserting portion 12 d is configured to be substantially circularcylinder shape or circular truncated cone shape (shown by adashed-dotted line), at least a portion of which has a diameter equal toor greater than that of the ear canal. By providing such insertingportion 12 d, in addition to the plug 12 mating with the dimple insidethe tragus, a friction force between the exterior surface of theinserting portion 12 d and the ear canal prevents dropping off of theplug 12 with higher certainty. Particularly, in case that an externalforce acts to rotate connecting portion 12 b in the direction shown byan arrow T2, in relation to such an external force, the plug 12 is torotate in the direction shown by an arrow T3. At this time, the plug 12,which has the inserting portion 12 d, a frictional force and a stressthereof, can resist such rotation, and dropping off of the plug 12 canbe prevented with higher certainty than the case without the insertingportion 12 d.

Also in this case, by providing a cutout or a through hole through theentirety of the plug 12 and the inserting portion 12 d, the acoustichole 12 c can be secured. Thereby, safety of the user during sleep issecured and convenience for the user is enhanced.

Considering that the ear canal in general has a shallow curve in forwardand the upward direction, by making the inserting portion 12 dpreferably deformable along the shape of the ear canal, the frictionalforce with the ear canal is secured, and at the same time, a botheredfeeling or a feeling of pressure of the user can be prevented. Forexample, in case that the plug 12 is formed from silicone rubber, theinserting portion 12 d can be formed from less rigid material, such asurethane or another pressure relieving material. Or in case ofintegrally molding the plug 12 and the inserting portion 12 d from thesame material such as silicone rubber, the inserting portion 12 d can beconfigured less rigid and deformable by having a cavity 12 d of adiameter of about 2 millimeters, as shown in FIG. 5C. In this case,configuring the cavity to function as acoustic hole 12 c is a preferableembodiment from the standpoints of simplifying the structure andfacilitating molding.

Alternatively, as shown in FIG. 5D, the inserting portion 12 d can beconfigured to have its center which has a certain degree of anglerelative to the center CL of the plug 12. Specifically, since the earcanal, in general, has a shallow curve in forward and the upwarddirection, the inserting portion is provided in such an angle that it isinserted along the ear canal, when worn, to the forward and the upwarddirection of the user's face.

Thereby, through deformation of the inserting portion 12 d along the earcanal, a stress acts to the plug 12, and slight displacement of theposition of the plug 12 relative to the tragus can be prevented. Thatis, positional relation of the plug 12 with the tragus is maintainedpreferable, and at the same time, the frictional force between theinserting 12 d and the ear canal is obtained. Thereby, dropping off ofthe plug 12 can be prevented more reliably. Together with this, afeeling of pressure of the user can be prevented.

FIG. 6 is a drawing for explaining a variation of the inserting portion12 d. The inserting portion 12 d can be configured to have a shaftextending along the direction of insertion which has a plurality ofprotrusions projected in substantially the perpendicular directions ofthe direction of insertion.

For example, as shown in FIG. 6A, a shaft 120 d can be provided withplurality of frictional plates 121 d of sword guard like flange-shape.Or, as shown in FIG. 6B, the frictional plates 121 d can be arranged inspiral so as to shape a root of screw thread around the shaft 120 d.

In cases of FIG. 6A and FIG. 6B, the planar shape of the frictionalplates 121 d can vary such as circular shape as shown in FIG. 6C,cloverleaf shape as shown in FIG. 6D, heart shape as shown in FIG. 6E orthe like. Further, each of the frictional plates 121 d can havedifferent shapes. In case of circular shape as shown in FIG. 6A, acutout or a through hole can be provided so as to secure the acoustichole 12 c. Or, in cases of cloverleaf shape as shown in FIG. 6D or caseof heart shape as shown in FIG. 6E, without a cutout or a through hole,an opening as acoustic hole 12 c can be secured. In cases of FIG. 6 Athrough FIG. 6E, the frictional plates 121 d are preferably formed froman elastic material such as silicone rubber. In this configuration, evendiameters of the ear canal varies among individuals, the frictionalplate can bend to ensure close contact with the ear canal when insertedthereinto. Thereby, the frictional force with the ear canal is enhanced,and dropping off of the plug 12 is prevented reliably. At the same time,a contact sensation with the ear canal can be softened and a feeling ofpressure of the user is prevented.

Further, by applying the configuration shown in FIG. 5C to theconfigurations shown in FIG. 6A through FIG. 6E, the shaft 120 d canhave a cavity so that the inserting portion 12 d can be deformableoverall. Or, the shaft 120 d can have an angle relative to the center ofthe plug 12 so as to fit the ear canal. Thereby, the frictional forcewith the ear canal can be secured, and at the same time, giving abothered feeling or a feeling of pressure to the user is prevented. Inthis configuration, the frictional force with the ear canal can besecured, and at the same time, a contact sensation with the ear canalcan be softened, therefore, dropping off of the plug 12 can be preventedand also the user's bothered feeling or a feeling of pressure can bereduced.

Alternatively, a configuration in which the center of the plug 12 andthe center of shaft 120 d are deviated is possible. In FIG. 6F, across-sectional view of the center of the plug 12 and shaft 120 d insuch a configuration is shown. As illustrated, the center of the plug 12and the center of shaft 120 d are deviated, thereby positional relationof the plug 12 with the tragus and positional relation of the insertingportion 12 d with the ear canal are maintained preferable.

Further, in this case, the shaft 120 d can be formed from an elasticmaterial such as silicone rubber or the like, and formed to have cavity121 h inside, so that the shaft 120 d can be deformable along the earcanal. In this case, cavity 121 h can be configured to be enclosedspace, so that deformation is facilitated and contamination of theinside of the cavity is prevented. Further, as shown in FIG. 6G, theshaft 120 d can have an angle relative to the center CL of the plug 12so as to fit the ear canal.

In this configuration, dropping off of the plug 12 and the insertingportion 12 d cab be prevented.

In FIG. 6F and FIG. 6G, the diameter of the frictional plates 121 d areconfigured so as to become smaller as getting closer to the tip end.Since the ear canal, in general, is taper off to the end, such aconfiguration can secure the frictional force of the inserting portion12 d with the ear canal and soften the contact sensation with the earcanal. By this means, dropping off is avoided and user's botheredfeeling or feeling of pressure is reduced.

Second Practical Example of Fixing Member

FIG. 7 is a drawing for explaining the second practical example of theplug 12 as the fixing member. FIG. 7A shows a plane view of right-sideplug 12 as an example, and FIG. 7B shows a lateral view of the plug 12.Here, to facilitate understanding, the connecting portion 12 b is notillustrated. FIG. 8 shows using status of the second practical example.FIG. 8 shows, by using a right ear as an example, names of parts of theear and, by a dotted line, the status of the plug 12 plugged therein.

In FIG. 7 and FIG. 8, the right in the plane of the paper corresponds tothe forward direction of the user, that is, the side of the face of theuser, the left in the plane of the paper corresponds to the backwarddirection, that is, the back side of the head of the user, and theperpendicular direction of the plane of the paper corresponds to thelateral direction of the user. In the second practical example, the plug12 is configured with a plate piece which extends longitudinally in theanteroposterior direction, and has a longitudinal length L whichreaches, when worn, the dimple inside antitragus from the dimple insidethe tragus. The plug 12 has, for example, asymmetric shape in theanteroposterior direction and/or the vertical directions, that is,preferably a broad be a n-shape which has a large-diameter portion ofdiameter R′ and a small-diameter portion of diameter r′ connected in theanteroposterior direction.

The plug 12 has a latching portion 124 a to latch in the dimple insidethe tragus, and adding to this, in a position substantially opposing thelatching portion 124 a in the longitudinal direction, a latching portion124 b to latch in the dimple inside antitragus. The latching portion 124a has a curved surface which curves in the vertical direction and/or thelateral direction along the shape of the dimple inside the tragus.Likewise, the latching portion 124 b has a curved surface which curvesin the vertical direction and/or the lateral direction along the shapeof the dimple inside antitragus. More preferably, the plug 12 has alatching portion 124 c which latches in the dimple inside the incisuraintertragica. The latching portion 124 c has a curved surface whichcurves in the vertical direction and/or the lateral direction along theshape of the dimple inside incisura intertragica.

FIG. 7B shows a side view from the direction of arrow P in FIG. 7A. InFIG. 7B, the upward direction in the plane of the paper corresponds tothe right side of the user, and the downward direction in the plane ofthe paper corresponds to the left side of the user, that is, side of thehead of the user. In one of preferable embodiments, the plug 12 curves,in its side geometry, so that the latching portion 124 a curves towardsentrance of the ear canal, and the latching portion 124 b curves in theopposite direction. That is, the plug 12 has a shallow S-shape overall.

With regard to the plug 12 described above, a preferable size of thelength L in the longitudinal direction is, for example, from 13 to 30millimeters. A preferable size of the diameter R′ of the large-diameterportion is, for example, from 13 to 20 millimeters. On the other hand, apreferable size of the diameter r′ of the small-diameter portion is, forexample, from 7 to 15 millimeters. Further, a preferable size of thethickness H′ of the plug 12 is, for example, from 2 to 10 millimeters.Shapes and sizes described above, however, is an example, and shapes ofthe large-diameter portion and the small-diameter portion are notlimited to precise circular shape. The plug 12 can be, for example,arbitrary shape comprising flat surface or free-form surface. Shapes ofthe latching portions 124 a, 124 b, or 124 c can be arbitrary shape aslong as they can latch namely on the tragus, antitragus, or incisuraintertragica.

In the second practical example, in addition to the latching portion 124a latching on the dimple inside the tragus, the latching portion 124 blatches on the dimple inside antitragus. Therefore, dropping off of theplug 12 scarcely occurs even when worn by a user who has a small tragus.Particularly, in case that a force acts so as to rotate entirety of theplug 12 to the forward direction as shown in FIG. 7B by an arrow D′, bylatching of the latching portion 124 b on the dimple inside antitragus,dropping off of the plug 12 is prevented. With regard to this, in theabove first practical example, the inserting portion 12 d prevents theplug 12 from dropping off by latching inside the ear canal, but in thissecond practical example, same advantageous result can be achievedwithout the inserting portion 12 d. Thereby, even a user who easilyfeels pain in the ear canal can bear long-term use. Nevertheless, aconfiguration comprising both of the latching portion 124 a of thissecond practical example and the inserting portion of the above firstpractical example is obviously possible. By such a configuration, sincethe latching portion 124 b latches on the dimple inside antitragus andthe inserting portion 12 d latches inside the ear canal, the force tohook is strengthened and dropping off of the plug 12 is prevented morereliably. Further, the plug 12 can latches with greater force to hook,by latching of the latching portion 124 c on the dimple inside incisuraintertragica.

In the above, a configuration in which each of the latching portion 124a, 124 b, and 124 c has curved surface to fit the shape of the dimpleinside the tragus, the antitragus, and the incisura intertragicarespectively, militates for increasing the area of the contact andenhancing the force to hook. Further, by a configuration in which thelatching portion 124 a curves toward the entrance of the ear canal andthe latching portion 124 b curves to the opposite direction of latchingportion 124 a so as to be in close contact with the dimple insideantitragus, contact areas with the dimple inside of the tragus and withthe dimple inside of antitragus are further increased and force to hookis strengthened.

Further, as is in the first practical example, the plug 12 can have acutout or a hole 124 d which leads to the ear canal as the acousticpassage. By this means, the user can hear sound of the outerenvironment. Therefore, safety and convenience for the user areenhanced. Or in another preferable embodiment, the plug 12 haselasticity in the longitudinal direction. Thereby, even in the case thatthe length between the tragus and antitragus varies among individuals,the plug 12 of the same size can be worn by different users. The plug12, to obtain elasticity, can be integrally molded from, for example,silicone rubber, natural rubber, polystyrene rubber, polyisoprenerubber, polyurethane elastomer, urethane, or another elastic material,and is connected to the connecting portion 12 b which has greaterrigidity than the plug 12. By the function of the elastic material as acushion, an advantageous result is also achieved such that the user'spain is reduced. The plug 12, by having S-shape overall in its sidegeometry, can more easily bend in the longitudinal direction so as toobtain elasticity.

FIG. 9 is a drawing for showing an variation of the second practicalexample. FIG. 9A through FIG. 9D show examples of the plug 12 which caneasily bend overall in the longitudinal direction so as to obtainelasticity.

FIG. 9A shows an example of the plug 12 having a hole 125 a in thesmall-diameter portion. FIG. 9B shows an example of the plug 12 having,in the small-diameter portion, the longitudinal slits 125 b along thelongitudinal direction of the plug 12. FIG. 9C shows an example of theplug 12 having a cavity (hollow space or the dimple) 125 c in thesmall-diameter portion. FIG. 9D shows an example of the plug 12 having acutout 125 d in the small-diameter portion.

In examples of FIG. 9A through FIG. 9D, since rigidity of thesmall-diameter portion which has the hole 125 a, the slits 125 b, thecavity 125 c, or the cutout 125 d is comparatively reduced, the plug 12becomes easy to bend therein. Hence, the plug 12, by bending overall,obtains elasticity in the longitudinal direction. Here, the hole 125 a,the slits 125 b, or the cutout 125 d provided in the plug 12 canfunction as the acoustic passage.

FIG. 10 is a drawing for explaining a connecting structure of the plug12 and the connecting portion 12 b. FIG. 10A shows, for example, a planeview of right-side plug 12 together with a part of the connectingportion 12 b. FIG. 10B shows a cross-sectional view along a line NN′ inthe FIG. 10A. In FIG. 10A and FIG. 10B, the right in the plane of thepaper corresponds to the forward direction, and the left in the plane ofthe paper corresponds to the backward direction.

Here the plug 12 is configured to be divided into an inner structure 12i and an outer structure 12 o, and the inner structure 12 i and theouter structure 12 o are formed from different materials. That is, theinner structure 12 i and the connecting portion 12 b are integrallymolded from a material which has a certain degree of rigidity, such asnylon or the like. On the other hand, the outer structure 12 o of theplug 12 is formed from an elastic material such as silicone rubber,urethane or the like. In this configuration, the plug 12 can have acertain degree of rigidity overall and a greater frictional force whenplugged in inside the tragus or the antitragus, and thus dropping off ofthe plug 12 can be prevented. At the same time, contact sensation can besoftened, and the user's pain can be reduced.

Here, by shortening the length L′ of the inner structure 12 i in thelongitudinal direction of the plug 12, the length L1 and L2 of the outerstructure 12 i in the longitudinal direction of the plug 12 can belengthen. Thereby, elasticity of the plug 12 in the longitudinaldirection can be secured.

Here, a preferable size of the length L′ of the inner structure 12 i inthe longitudinal direction of the plug 12 is, for example, from 3 to 15millimeters. And a preferable size of the length L1 of the outerstructure 12 o in the longitudinal direction of the plug 12 from innerstructure 12 i towards the forward direction is, for example, from 0.5to 26 millimeters. On the other hand, a preferable size of the length L2of the outer structure 12 o in the longitudinal direction of the plug 12from inner structure 12 i towards the backward direction is, forexample, from 0.5 to 26 millimeters. Shapes and sizes described here areexamples, and various shapes and sizes are possible as long as theysatisfy the requirements described above. For example, a length in thevertical direction of the plug 12 such as to reach the crus helicis isalso possible, as long as the plug 12 has the latching portions 124 a,124 b, and the longitudinal length L.

Further in the second practical example, as shown by an arrow D1, bydeformation of the plug 12 in the anteroposterior direction with a jointwith the connecting portion 12 b as a center, a tilting movement in theanteroposterior direction can be simulated. Direction in which the earfaces varies among individuals, and some users have comparativelyforward facing ears while the others have comparatively laterally facingears. The plug 12, by tilting in the anteroposterior direction, can beadapted to such variation, and can be fixed in the desired positionwithout depending on the direction of the user's ears.

In one of preferable embodiments, the outer structure 12 o and the innerstructure 12 i of the plug 12 are configured to mate with each other toenable attachment and removal. Thereby, the plug 12 can be disassembledand cleaned, so that the sanitation is maintained. In this case, in thecombination of the outer structure 12 o and inner structure 12 i, themating portions have different mating shape between the both sides. Forexample, the outer structure 12 o of the plug 12 as shown in FIG. 10Chas the mating portion 124 k of C-shape with an opening upward, which isasymmetric in the anteroposterior direction. Thereby, an attempt ofmating the plug 12 with the mating portion 12 b of an opposite sideresults failure, in which incorrect assembly is easily detected, and inwhich correct assembly can be assisted. Further, on the outer structure12 o of the plug 12, a cutout or a hole 124 d can be provided as theacoustic passage along the C-shape of the mating portion 124 k. Theshape of the mating portion 124 k can vary without being limited to theabove example. The shapes of the mating portions 124 k on the both sidescan obviously be totally different.

Third Practical Example of Fixing Member

FIG. 11 is a drawing for explaining the third practical example of theplug 12 as the fixing member. The third embodiment is more preferablefor preventing dropping off of the plug 12 with higher certainty. Thethird practical example can be practiced solely or in combination witheither of above described the first, or the second practical examples.

In the configuration shown in FIG. 11A, the wearing tool 14 furthercomprises a hook-shape ear hooking portion 13 as the latching member tolatch around ear. The ear hooking portion 13 is connected to the endportion of the strap 10 to which the plug 12 is connected. Preferably,as shown in FIG. 11A, the ear hooking portion 13 is connected to theconnecting portion 12 b of the plug 12. By this means, the plug 12 andthe ear hooking portion 13 can be integrally molded from the samematerial, for example, silicone rubber or the like. Alternatively, theplug 12 and the ear hooking portion 13 can be formed from differentmaterials. In that case, it is preferable that the ear hooking portion13 is formed from such a material as to have certain degree ofelasticity and rigidity, so that the hook-shape is secured, as well asthe facility of hooking around the ear. Examples of such a material are,nylon, acetyl cellulose, celluloid, or another rein, or titanium,stainless, aluminum, duralumin, or another metal.

By the above configuration of the ear hooking portion 13, dropping offof the plug 12 can be prevented with higher certainty. Further, even ifthe plug 12 drops off, the ear hooking portion 13 can prevent droppingoff of the entirety of the wearing tool 14.

It is preferable to configure, as shown in FIGS. 11B and 11C, across-sectional shape of the ear hooking portion 13 along a dotted lineAB to be spindle-shape (FIG. 11B) or circular-shape (FIG. 11C) whichhave curved line on the side which makes contact with the environs ear,for preventing biting of the ear hooking portion 13 into the base of theear. Thereby, user's pain can be reduced. Especially, in the case ofspindle-shape, since thickness of the top portion A of thecross-sectional shape in FIG. 11B is thin, feeling of pressure isreduced even when the user lies on the side with his ear pressed by apillow.

Further, diameter of the ear hooking portion 13 is not required to beconsistent. An example is that, the central portion 13 b, which generatethe most force to latch when latching around the ear, has the largestdiameter, and the tip portion 13 a has a smaller diameter. Thereby,twist of the central portion 13 b can be avoided so that the hook-shapeand thus the facility to latch around the ear are secured, and bitingaround the ear is also prevented. On the other hand, the tip portion 13a is deformable to some degree along the shape of the environs of theear, and pressure to the environs of the ear is reduced.

As shown in FIG. 11D, the ear hooking portion can be configured to berotatable relative to the plug 12 in the direction shown by an arrow T4.For example, the plug 12 and the ear hooking portion 13 can be acombination of separate components combined rotatably, or the plug 12and the ear hooking portion 13 can be integrally molded by the samematerial which has some degree of elasticity such as silicone rubber, sothat rotation is realized by twisting the entirety. By doing so, theuser can wear the wearing tool 14 in such manners that the user firstlatches the ear hooking portion 13 around the ear, then plug the plug 12into the dimple inside the tragus by rotating the plug 12. Or, the usercan wear the wearing tool 14 in steps such as latching the ear hookingportion 13 around the ear by rotating the ear hooking portion 13, afterplugging the plug 12 in the dimple inside the tragus. By this means, thewearing tool 14 can be more easily worn than the case that the plug 12and the ear hooking portion 13 are not rotatable. The preferable size ofdiameter of the ear hooking portion 13 shown in FIG. 11A through FIG.11D, is from 3 to 10 millimeters for reducing biting to the environs ofthe ear. The embodiment of the presented invention, however, is notlimited to this range.

Alternatively, the ear hooking portion 13 can be loop-shape as shown inFIG. 11E. In this case, the ear hooking portion 13 is formed from anstretch material so as to enable latching around the ear. This shape isthat of so called cold mask-style, however, since the ear hookingportion 13 of this type is used as a secondary latching means in thisembodiment, the user's pain is less than the case of the ear hookingportion 13 is solely used. By this means, the ear hooking portion 13 canprevent dropping off of the plug 12 with higher certainty.

FIG. 12 is a drawing for explaining a variation of the plug 12 and theear hooking portion 13. In this variation, as shown in FIG. 12A, theplug 12 and the ear hooking portion 13 are formed from differentmaterials so that attachment and removal thereof are enabled. Forexample, the plug 12 is formed from a material which has some degree ofelasticity, durability, and biocompatibility, such as silicone withhardness of 40 degrees. On the other hand, the ear hooking portion 13 isintegrally molded together with the connecting portion 12 b and thebuckle 12 a by a material which has some degree of elasticity andrigidity such as nylon. And the plug 12 and the ear hooking portion 13are attached each other by the mating portion 122 a of the ear hookingportion 13 which mates in a hole 122 b provided on the plug 12.

Here, exterior appearances of variations of the plug 12 are shown inFIG. 6F and FIG. 6G. In this case, cavity 121 h shown in FIG. 6F or inFIG. 6G can be connected or can be disconnected to the hole 122 b. Inthe configuration in which the cavity 121 h is connected to the hole 122b, molding is facilitated.

In this way, the plug 12 and the ear hooking portion 13 are configuredto enable attachment and removal, they can be easily disassembled andcleaned, or worn components can be easily replaced. Hence, conveniencefor the user is enhanced.

In this variation, a tip portion 13 a of the ear hooking portion 13 is,as shown in an enlarged view in FIG. 12B, shaped as skewered multiplediscs, so that the diameter is intermittently changes. Thereby, when theear hooking portion 13 is integrally molded from the same material,rigidity of the tip portion 13 a can be comparatively reduced. By thismeans, the region around the central portion 13 b of the ear hookingportion 13 can resist twist so as to maintain the hook-shape, and tofacilitate latching around ear. And at the same time, biting into theenvirons of the ear is prevented. On the other hand, the tip portion 13a can be deformed to some degree along the shape of the environs of theear, so that pressure to the environs of the ear is reduced.

Further, an exterior appearance of the ear hooking portion in Y-Z axisis shown in FIG. 12C with the lateral direction of FIG. 12A as X-axis,the vertical direction of FIG. 12A as Y-axis, and the perpendiculardirection to the plane of the paper as Z-axis. The ear hooking portion13 can be formed to have sterically-skewed shape, so that the portionfrom the central portion 13 b to the connecting portion 12 b and the tipportion 13 a have different angles in Y-Z plane. Thereby, the earhooking portion 13 can better fit the shape of curved surface of theenvirons of the ear, when worn by the user. Hence, the ear hookingportion 13 can be fixed reliably around the ear, and a contact sensationof the user is softened so that the user's pain can be prevented.

[2] Second Embodiment of Wearing Tool

FIG. 13 is a drawing for explaining the second embodiment of the wearingtool 14. The wearing tool 14, which is provided on an end portion of thestrap 10 opposite to the other end portion which is connected to thebreathing mask 8, latches at the position of the ear of the user. FIG.13 shows the wearing tool for the right ear as an example, with theright in the plane of the paper corresponding to the forward direction,and the left in the plane of the paper corresponding to the backwarddirection.

As illustrated, the wearing tool 14 has a frame portion 130 a which hasan upside-down U-shape curve. The frame portion 130 a has on one endportion the buckle 12 a to be connected to the strap 10, and has on theother end portion a biasing portion 130 b. The biasing portion 130 b isprovided inside the frame portion 130 a. The frame portion 130 a and thebiasing portion 130 b are integrally molded so that they shape a hairpincurve overall, binding together at curving portion 130 c. For example,the frame portion 130 a and the biasing portion 130 b are, as with theabove ear hooking portion 13, formed from an material which has certaindegree of elasticity and rigidity such as, nylon, acetyl cellulose,celluloid, or another rein, or such as titanium, stainless, aluminum,duralumin, or another metal.

The biasing portion 130 b has a length half to three fourth of thevertical length of the frame portion 130 a. Together with this, thebiasing portion 130 b has a slightly curved shape along the shape of thebase of ear, and the tip end of the biasing portion 130 b is apart fromthe frame portion 130 a. The frame portion 130 a and the biasing portion130 b are formed so that they have substantially circularcross-sectional shape. The curving portion 130 c is configured to have acomparatively small diameter compared with the diameters of the frameportion 130 a and the biasing portion 130 b, and thus to havecomparatively low rigidity. In this configuration, the biasing portion130 b tilts in the anteroposterior direction as shown by an arrow D2with the curving portion 130 c as a pivot.

Here, a case is shown in which the second embodiment is practicedtogether with the plug 12 of the first embodiment, however, the secondembodiment can be solely practiced. And the breathing mask in practicingthe second embodiment can be a breathing mask which covers only theenvirons of the nostril, or a breathing mask which covers the nostrilsand the mouth.

FIG. 14 is a drawing for explaining a using status of the wearing tool14. In FIG. 14, to facilitate understanding, the plug 12 is notillustrated. FIG. 14 shows right ear as an example, and the right in theplane of the paper corresponds to the forward direction, and the left inthe plane of the paper corresponds to the backward direction. The frameportion 130 a is placed to surround and circumvent the environs of theear flap. The biasing portion 130 b, within the frame portion 130 a,abuts the base of the ear from behind the ear, and biases in the forwarddirection. For reliably securing the wearing tool 14, the frame portion130 a and the biasing portion 130 b can be curved shape in the lateraldirection of the user, or in the other word, in the perpendiculardirection in the plane of the paper in FIG. 14, so as to fit the shapeof the environs of the ear at temporal area of the user.

In the second embodiment, since the frame portion 130 a surrounds andcircumvents the environs of the ear flap, placing of the burdentopically on the base of the ear due to the tension of the strap 10connected to the buckle 12 a can be prevented. Therefore, the occurrenceof a pain, as with cold mask-style wearing tool, caused by elastic bandsor the like placing burden topically on the base of the ear isprevented. Especially, the occurrence of a pain due to biting of theelastic band on the top portion of the base of ear can be prevented.Also, even when the user lies on the side, the occurrence of pain causedby the frame portion 130 a being pressed between the ear and the head,and thus biting the back of the ear and the head portion can beprevented.

By the biasing portion 130 b biasing allover the base of the ear, thebreathing mask can be fixed reliably. Also, although the shape and thesize of the ear vary among individuals, gaps between the biasing portion130 b and the base of ear barely occur, and thus force to hook isenhanced. Therefore, increase of a pain due to displacement of wearingtool and thus scraping therein can be prevented. Thereby, pain and adiscomfort feeling caused by wearing the breathing mask can be reduced.

FIG. 15 is a drawing for explaining examples of the shape of the biasingportion 130 b. FIG. 15A shows an example in which the biasing portion130 b has its tip end connected to the frame portion 130 a and shapes aloop. Preferably, the diameter of the biasing portion 130 b isconfigured to be smaller than the diameter of the frame portion 130 a.In this configuration, a loop shaped by the biasing portion 130 b bowsand performs biasing. FIG. 15B shows an example in which the biasingportion 130 b has its tip end connected to the frame portion 130 a andshapes accordion, and by bowing thereof biasing is performed. FIG. 15Cshows an example in which the biasing portion 130 b and the frameportion 130 a bind together at the central portion, not at the tip endof the frame portion 130 a, and the tip end of the biasing portion 13 bis apart from the frame portion 13 a, so that the overall shape isbranched-shape. Preferably, the diameter of the biasing portion 130 b isconfigured to be smaller than the diameter of the frame portion 130 a.By this means, the biasing portion 130 b is enabled easily to tilt inthe direction shown by an arrow D3, and the biasing portion 130 bperforms biasing through titling. The second embodiment includesconfigurations in which the biasing portion 130 b is realized bypressure relieving material as sponge or the like, alpha gel, or metalspring or the like, which is provided on the frame portion 130 a.

FIG. 16 is a drawing for explaining a variation of the secondembodiment. FIG. 16A shows an example of the wearing tool 14 of whichthe buckle 12 a has plurality of the strap holes 12 s. By this means,the length of the straps 10 can be adjusted in a stepwise fashion, andwearing can be done more flexibly. FIG. 16B shows an example of thestrap holes 12 s arranged in different angles in a fan-like fashion. Bythis means, angles of the straps 10 relative to the frame portion 130 acan be adjusted. Therefore, individual difference of the user inpositional relationship between the nostrils and the ear can beaddressed.

FIG. 16C shows an example of the wearing tool 14 which has on the frameportion 130 a latching portion 130 d to latch on the crus helicis (seeFIG. 8). By this means, the force to latch is enhanced. FIG. 16D showsan example of the wearing tool 14 which has a rib 130 e inside ofU-shape shaped by the frame portion 130 a. A cross-sectional shape on adotted line FF′ is illustrated in lower section. Thus, by making thediameter small, the frame portion 130 a can be formed smaller andlighter with, and at the same time, rigidity of the frame portion 130 ais secured as shown in FIG. 16E. Alternatively, in place of providingthe rib 130 e, the frame portion 130 a can be configured to have across-sectional shape of spindle-shape tucking in the inward direction Fas shown in FIG. 16F. Here, by configuring the rib 130 e or an edge ofspindle-shape to have the shape and the sizes so as to surround and tocircumvent the environs of the ear flap, scraping of rib 130 e againstthe top of the base of ear and thus causing pain are prevented.

In case of practicing the second embodiment together with the plug 12 ofthe first embodiment, by biasing of the biasing portion 130 b, thepressures placed on the tragus or the antitragus can be distributed. Andthus a pain or a discomfort feeling of the user caused by wearing thebreathing mask can be reduced.

[3] Third Embodiment of Wearing Tool

In the third embodiment, the wearing tool 14 has supporting memberprovided along the longitudinal direction of the wearing tool 14.

FIG. 17 is a drawing for explaining configuration of the supportingmember. FIG. 17A shows, by using the right-side strap 10 of the firstembodiment as an example, the supporting member provided on the strap10. However, the third embodiment can be practiced solely, or togetherwith any of the wearing tools of the first, the second, or anotherembodiments. And the breathing mask in practicing the third embodimentcan be a breathing mask which covers only the environs of nostrils, or abreathing mask which covers the nostrils and the mouth of the user.

As shown in FIG. 17A, the strap 10 is provided with, as the supportingmember, a panel 16 which extends in the longitudinal direction of thestrap 10 and has a certain length in the width direction, and hasgreater rigidity than the strap 10. The panel 16 is preferably formedfrom a material which has robustness, adding to rigidity, such as nylon,polyacetal, polypropylene or the like. And the strap 10 and the panel 16are fixed each other at least at the rim portion of the panel 16 bystitching or by resin adhesion or the like. And the mating portion 16 awhich can mate with the side portion of the breathing mask 8 is providedat the end portion of the panel 16. By this means, the strap 10 isconnected to the breathing mask 8 by the panel 16.

The panel 16 has a certain length in the longitudinal direction and inthe width direction of the strap 10, and has certain degree of rigidity,therefore the following advantageous results are achieved. Firstly, evenwhen pressurized gas for breathing is supplied to the inside of thebreathing mask 8 and a tensional force acts on the longitudinaldirection of the strap 10, a stress in the longitudinal direction canprevent extension of the strap 10, and thus the breathing mask 8 can bein close contact with the environs of the nostrils of the user.Secondly, even when an external force acts to twist the breathing mask 8in the width direction of the strap 10, as shown by an arrow T5, astress in the width direction prevents twist of the strap 10 and thusdisplacement of the breathing mask 8.

Here, more preferably, the panel 16 has, in the region of the endportion which is connected to the side portion of the breathing mask 8,a plane portion 16 b which has a width in the width direction and alength the longitudinal direction. For example, for the panel 16 whichhas a length from 3 to 15 centimeters in the longitudinal direction andwidth from 2 to 5 centimeters in the width direction, plane portion 16 bis configured to have a plane region which has a length more than 1centimeters in the longitudinal direction and a width more than 2centimeters in the width direction. By this means, a stress againsttwist in the width direction can be enhanced, hence twist is preventedwith higher certainty. However, the sizes of plane portion 16 b are notlimited to the above figure range.

In further preferable embodiment, the panel 16 has a width, in a portionof the longitudinal direction, which is narrower than the width of theend portion which is connected to the breathing mask 8. Specifically, asshown in FIG. 17A, the panel 16 has a with W1 at the end portion whichis connected to the breathing mask 8, and has a width W2 which isnarrower than the width W1 in a portion which lies from the centerportion to a portion closer to the plug 12 in the longitudinaldirection. In other words, the panel 16 has, so to say, a hollowed shapein the upper region.

The panel 16 is required to have a certain degree of rigidity so as tofix the breathing mask 8 at the environs of the nostrils of the user andto prevent its displacement. However, since the strap 10 passes on thecheekbones of the user when worn, as illustrated in FIGS. 2A and 2B,there is the concern that, if the panel 16 is provided to the entiretyof the strap 10, the panel 16 is in contact with the cheekbones andgives pain to the user. Therefore, by the panel 16 of above shape,contact of the panel 16 with the cheekbones is prevented, or, region ofcontact could be reduced even in case of the contact occurs, and thusgiving pain to the user is prevented.

As for the shape of the strap 10, when the panel 16 is provided, widthW3 of a portion of the strap 10 which goes through the buckle 12 a ofthe plug 12 and folds back, is preferably configured to be narrower thanthe width W4 of the portion on which the panel 16 is provided. Then thepanel 16 which has the above described shape is provided in the positionwhich does not overlap with the strap 10 which folds back. Thereby, thepanel 16 and the strap 10 which folds back can be configured to avoidoverlapping each other.

By this means, when the end portion of the strap 10 which goes throughthe buckle 12 a and folds back, surface area of the strap 10 is securedto be latched by planate fastener 10 b which is provided on the endportion of the strap 10. Hence, the flexibility in adjustment of thelength of the strap 10 is enhanced. Together with this, the end portionof the strap 10 which folds back and has the planate fastener havepositional relation to the panel 16 so as not to overlap, the strap 10and the panel 16 can be configured so that entire thickness of the strap10 and the panel 16 can be reduced. Thereby, even when the user lies onthe side with the side of his face pressing against a pillow, paincaused by biting of the strap 10 and the panel 16 into the face of theuser is prevented.

The panel 16 also can be provided with a discriminating means todiscriminate between the left and right. For example, as shown by FIG.17B in an enlarged view of a region of the panel 16 in which the matingportion 16 a is provided to mate with the breathing mask 8, protrusion16 p is provided on the panel 16, by which the left and right arediscriminated according to the presence or absence of the protrusion 16a, or the number thereof. Alternatively, characters, symbols, or figurescan be used as the discriminating means. Thereby, the user can easilydiscriminate the left and the right of the wearing tool 14 and thebreathing mask 8, when the user connects them. By this means, when theuser disassemble and clean the wearing tool 14 and reassemble it,efficient and accurate performance is assisted.

As also shown in FIG. 17C, the panel 16 is applied to the strap 10 incase that the plug 12 and the ear hooking portion 13 are in practice. Inthis case, in addition to an advantageous result by the ear hookingportion 13 on preventing dropping off of the plug 12, anotheradvantageous result is also achieved by the panel 16 on preventing twistof the strap 10. Hence, the breathing mask 8 can be fixed in closecontact with the environs of the nostrils of the user with highercertainty.

FIG. 18 is a drawing for explaining a variation of the panel 16. FIG.18A through FIG. 18C show examples of the shape of the plane portion 16b. As shown in FIG. 18A through FIG. 18C, the plane portion 16 b canhave an arbitrary shape which corresponds to the shape of the planefastener 10 b so that the end of the strap 10, when folding back, doesnot overlap with the plane portion 16 b.

FIG. 18D also shows a shape of the panel 16, which has wider width inthe portion close to the end portion which is connected to the plug 12.By means of this shape, plurality of plane portions 16 b and 16 c can beprovided which have widths in the width directions. Therefore, a stressagainst the force to twist in the width direction can be increasedcompared with the cases shown by FIG. 17A or FIG. 18A through FIG. 18C.And, by configuring the panel 16 to have shortened width at the centerportion in the longitudinal direction, the plane fastener 10 b on theend portion of the strap 10 which folds back can latch around thecentral portion of the strap 10. Consequently, effectiveness is enhancedon preventing twist of the strap 10 without reducing flexibility ofadjustment of the length of the strap 10. Contact of the panel 16 withthe cheekbones can also be prevented, and thus pain of the user can bereduced. Increase of thickness of the strap 10 and the panel 16 due tooverlapping can be prevented. Hence, giving the user a pain due to thestrap 10 pressing into the face, when the user lies on the side, can beprevented.

[4] Fourth Embodiment of the Wearing Tool

In the fourth embodiment, the wearing tool 14 has the supporting memberprovided in the longitudinal direction. This supporting member comprisesa first plate-shape member which is fixed to the breathing mask 8 and asecond plate-shape member which is fixed to said connecting member. And,the first and the second plate-shape members are configured to berotatable. The fourth embodiment can be solely practiced, or can bepractice with any of wearing tools of the first and the secondembodiments, and another the wearing tool. The breathing mask in thepractice of the fourth embodiment can be a breathing mask which coversonly the environs of the nostrils of the user, or a breathing mask whichcovers the nostrils and the mouth of the user.

FIG. 19 is a drawing for explaining the panel 16 as the supportingmember. FIG. 19A shows a plane view of the right-side panel 16, and FIG.19B shows a cross-sectional view on an arrow P′. The panel 16 isconfigured to have the first plate-shape member 160 a which has a matingportion 16 a to be connected to the breathing mask 8, and the secondplate-shape member 160 b which is connected to the strap 10. Plate-shapemembers 160 a and 160 b are combined each other so that they arerotatable around a rotation axis 160 c. The rotation axis 160 c isconfigured with protrusion provided on the plate-shape member 160 a (or160 b) and a hole (alternatively a concave or a cutout) with which theprotrusion mates, provided on plate-shape member 160 b (or 160 a). Here,the plate-shape member 160 a and overlapping portion of the plate-shapemembers 160 a and 160 b are shaped fan-like shape, and the rotation axis160 c is provided in the position of the pivot point of the fan-likeshape. In a preferable embodiment, the thickness of each of theplate-shape members 160 a and 160 b are from 0.1 to 3 millimeters.

In such a configuration, by connecting the plate-shape member 160 a tothe breathing mask 8, and by connecting the plate-shape member 160 b tothe strap 10, an angle between the breathing mask 8 and the strap 10 canbe changed. Here, since the rotation axis 160 c is provided in theposition corresponding to the bottom of the nostrils when the user wearsthe breathing mask 8, adjustment of the angle of the breathing mask 8 ispossible with the position of the bottom of the nostrils as a rotationaxis. This is explained in FIG. 20.

FIG. 20 is a drawing for explaining function of the fourth embodiment.This embodiment is particularly advantageous when practiced with thebreathing mask 8 that covers only the environs of nostril. In FIG. 20, aside face of the user is shown schematically. Here, a case of thenostrils facing upward with an angle of degree α and a case of thenostrils facing downward with an angle of degree β are typically shown,with the horizontal plane as a reference. Assumption is made such thatthe users have the nostrils which have angle substantially betweendegree α and degree β.

The breathing mask 8 is desired to cover the nostrils with no gapsoccurring at the rim portion which abuts the environs of the nostrils.However, as illustrated, since an angle of the nostrils varies amongindividuals, an angle of the rim portion of the breathing mask 8, or anangle of the breathing mask 8, is required to be adjusted according tothe angle of the nostrils, so that the rim portion of the breathing mask8 is brought into close contact with the environs of the nostrils. Forexample, in case that the angle of the nostrils is degree α, thebreathing mask 8 is required to be worn with an angle indicated by adotted line 81, and in case that the angle of the nostrils is degree β,the breathing mask 8 is required to be worn with an angle indicated by adotted line 82.

In this embodiment, since rotation axis 160 c is provided in a positionwhich corresponds to a position Nb of the bottom of the nostrils andplate-shape members 160 a and 160 b rotate around the position Nb as arotation axis, an angle of the breathing mask 8 can be adjusted aroundthe position Nb of the bottom of the nostrils as a rotation axis.

This brings an advantageous result as described below, compared with theconventional art. In general, when the user wears the breathing mask 8,the length of the strap 10 is firstly adjusted so that a portion of thebreathing mask 8, which is required to oppose the bottom of the nostrils(here such a portion is called “nostril bottom-opposing portion”), is inclose contact with the bottom of the nostrils. Next, after wearing thebreathing mask 8 by the strap 10, confirmation is made on whether thenostril bottom-opposing portion is in close contact with the bottom ofthe nostril. Here, if the breathing mask 8 is not in close contact withat least a portion of the environs of nostrils, or, to the contrary,compressing hard at least one portion of the environs of nostrils, thatis, if an angle of the breathing mask 8 is found inappropriate, by aconventional art which has an angle adjustment mechanism in the centerof the vertical direction of the breathing mask 8, the angle of thebreathing mask 8 is adjusted with a position Nm as a rotation axis whichis distanced from the position Nb of the bottom of the nostrils.Consequently, the nostril bottom-opposing portion is displaced from thebottom of the nostrils, and thus gaps occur at the bottom of thenostril, or, to the contrary, the bottom of the nostrils is pressedhard. Then, the lengths or the wearing position of the straps 10 need tobe adjusted again. In this away, since inappropriateness of an angle ofthe breathing mask 8 is found after adjusting the length of the strap10, necessity occurs to readjust the length of the strap 10 afteradjusting the angle of the breathing mask 8.

With regard to this point, in this embodiment, since the angle of thebreathing mask 8 is adjusted with the portion Nb of the bottom of thenostrils as a rotation axis, displacement of the nostril bottom-opposingportion of the breathing mask 8 is prevented. Therefore, even afteradjusting an angle of the breathing mask 8, necessity to readjust thelength of the strap 10 does not occur. By this means, wearing of thebreathing mask 8 accompanied by angle adjustment is facilitated, andconvenience for the user is enhanced.

Further, since the angle adjustment mechanism in conventional art has acertain degree of thickness, if the user rolls over and underlies theangle adjustment mechanism, there is the concern for the occurrence of adiscomfort feeling due to the face being pressed. With regard to thispoint, by this embodiment, entirety of angle adjustment mechanism can beconfigured to be thin, and thus such a discomfort feeling can beprevented.

The panel 16 explained above in the third embodiment is configured sothat upper side of a portion in the longitudinal direction is hollowedand has a narrower width than the end portion which is connected to thebreathing mask 8. In case of practicing this configuration together withthe fourth embodiment, the rotation axis 160 c on the plate-shapemembers 160 a and 160 b is preferably provided on the bottom portion ofthe panel 16, that is, on the extended line of the portion of narrowerwidth. Therefore, when rotating plate-shape members 160 a and 160 b,rigidity of allover he panel 16 is secured.

FIG. 21 is a drawing for explaining a variation of plate-shape members160 a and 160 b. In FIG. 21A through FIG. 21C, a fixing means is shownwhich fixes the rotate position of plate-shape members 160 a and 160 bwhen they are rotated. For example, FIG. 21A shows an example of thefixing means which is configured to be a gear mechanism having therotation axis 160 c of star shape, gear shape or the like. In thisexample, gear shape protrusions provided on the plate-shape member 160b, which are arranged on the circular arc around the rotation axis 160 cas the center, mate with gear shape holes or concave portionscorresponding to the rotation axis 160 c on the plate-shape member 160b. And, by mating of the both portions, the rotated position is fixed.And when plate-shape members 160 a and 160 b are rotated by a forcegreater than the force of mating of the gear mechanism, the fixation isreleased and then mate again at another rotated position. FIG. 21B showsan example of plate-shape member 160 b having an protrusion 160 dprovided near the circular arc of the plate-shape member 160 b, andplate-shape member 160 a having a hole or a concave portion 160 eprovided near the circular arc of the plate-shape member 160 a. In thisexample, plate-shape members 160 a and 160 b are rotated with therotation axis 160 c as a center, and the protrusion 160 d and the holeor the concave 160 e mate with each other. Thereby the rotated positionis fixed. FIG. 21C shows an example of the fixing means which isconfigured to have the plate-shape member 160 b having an protrusion 160f provided near the circular arc thereof, while the plate-shape member160 a having an arc shaped opening 160 g provided along the circular arcthereof. In this example, the opening 160 g of the plate-shape member160 b has a wave-formed portion on the rim. When the plate-shape members160 a and 160 b are rotated with the rotation axis 160 c as the center,the protrusion 160 f of the plate-shape member 160 b moves within theopening 160 g of the plate-shape member 160 a, and mates with the rootportion of the waveform. Hence, the rotate position is fixed.

FIGS. 22A and 22B are drawings for explaining an example of the panel 16of the third or the fourth embodiment being applied to conventionalheadgear-style wearing tool. The example shown in FIGS. 22A and 22B isan example of headgear-style wearing tool having straps 100 which areconnected to both sides of the breathing mask 8 and latch at the back ofthe head of the user. Each strap 100 is separated into two portions infront of the ear after passing by the cheekbones. And, both ends of theseparated portions are jointed in loop-shape on the top and the back ofthe head of the user, and thus the straps 100 latch around the head ofthe user.

In such a configuration, if rigid supporting members are provided onentire region of the straps 100 to prevent twist of the strap 100 in thewidth direction, there is the concern that the supporting members give apain to the user by a contact with the cheekbones.

Therefore, in achieving an object of preventing such pain and twist ofthe straps 100, application of the panels 16 of this embodiment to thestraps 100 can prevent contact with the cheekbones and thus giving theuser pain. And twist of the straps 100 in the width direction can beprevented.

In this way, the third or fourth embodiment can be also applied to aheadgear-style wearing tool. That is, the third or the fourthembodiments can provide on the wearing tool (the straps 100 in the aboveexample) the supporting members (the panels 16 in the above example)which are connected to the both sides of the breathing mask 8, and whichlatch around the head of the user; the supporting members extend in thelongitudinal direction of the wearing tool and has rigidity greater thanthe wearing tool, whereby the width of the supporting member on aportion of the longitudinal direction is narrower than the width ofother portions thereof.

FIG. 23 is a drawing for explaining an example of combination of thewearing tool 14 of the first and the third embodiments. Here, a usingstatus is shown of the wearing tool 14 having the above mentioned straps10, plugs 12, ear hooking portions 13, and panels 16. That is, one endportion of the straps 10 are connected to the both sides of thebreathing mask 8, and the other end portion of the straps 10 areconnected to the plugs 12. And the plugs 12 are plugged in the dimplesaround the tragi of the user and are fixed. Further, the ear hookingportions 13 are provided on the end portion of the straps 10, and theear hooking portions 13 latch around the ears.

Further, the panels 16 as supporting members are provided on the straps10. The panels 16 extend in the longitudinal direction of the straps 10and have certain degree of widths near the connecting portions with thebreathing mask 8, so as to configure a plane portion. By this means,excessive extension and contraction of the strap 10 in the longitudinaldirection can be prevented, and also twist in the width direction can beprevented. And the width of a portion which is in contact with thecheekbones is configured to be narrow, and thus the user's pain isprevented.

By the wearing tool 14 configured in this way, a pain or a discomfortfeeling which occur when the breathing mask 8 is worn can be reduced,and displacement of the breathing mask 8 is prevented. Further, wearingof the breathing mask 8 can be facilitated.

[5] First Embodiment of Breathing Mask

First, FIG. 23 is used to explain the overall configuration of thebreathing mask 8. The breathing mask 8 has a frame 20 which forms thecontour and is also connected to the flexible hose 4 b, and a cushion 30which is used in combination with the frame 20 and is in contact withthe environs of the nostrils of the user to cover it.

Here the configuration of a breathing mask of the prior art isexplained, and then this embodiment is explained.

FIG. 24 is a drawing for explaining the configuration of a breathingmask of the prior art. In FIG. 24, a cross-sectional view of thebreathing mask is shown schematically. The bottom of the figurecorresponds to the position of the environs of the nostrils of the userlying on the back. In general, a breathing mask has a frame 200 whichforms the outer shell of the breathing mask, and a cushion 300 providedon the periphery of the opening portion 204 of the frame 200 and whichabuts the environs of the nostrils of the user. The frame 200 has aninhaling port 202, joined to a flexible hose 4 b which supplies gas forbreathing. Here, a case is shown in which the inhaling port 202 isprovided vertically above the environs of the nostrils of the user lyingon the back.

A breathing mask configured in this way covers the nostrils of the userby means of the opening portion 204, and is fixed in close contact withthe environs of the nostrils of the user by a wearing tool. And, gas forbreathing, supplied from the inhaling port 202, is sent into thenostrils of the user.

Here, the inhaling port 202 and frame 200 are formed from materialshaving at least a certain degree of rigidity, such there is no change inshape upon application of an external force or upon occurrence ofnegative pressure within due to breathing by the user, and such thatthere is no blocking of the passage used to supply gas for breathing.

On the other hand, in order to send gas for breathing into the nostrilsof the user, it is desirable that the frame 200 be in close contact withthe face, and that an airtight state be secured. However, if the rigidframe 200 is pressed against the face, pain results, and moreover theshape of the rim of the opening portion 204 of the frame 200 does notnecessarily follow the shape of the face for each user, so that there isthe concern that gaps may occur. Hence the cushion 300 provided on therim of the opening portion 202 of the frame 200 should have a certaindegree of flexibility and elasticity.

In response to this demand, the frame 200 is for example formed frompolycarbonate. And, the cushion 300 is formed from silicone rubber.

However, in CPAP treatment, there are cases in which, in order to avoidexcessive drying of the mucous membrane within the nostrils, humidity isadded to the gas for breathing using a humidifier 6 as shown in FIG. 1.Further, the breath of the user himself contains moisture. The frame 200formed of polycarbonate does not have water repellent properties, sothat when temperatures are lower, in wintertime or in othercircumstances, there are cases in which the humidified gas for breathingand moisture contained in the breath may condense on the inner walls ofthe frame 200. And, when the user is lying on the back, there is theconcern that condensed water drops may grow to a size at whichgravitational force cannot be resisted, so that the drops drip onto theface of the user, causing the user to waken.

As a measure to address this condensation, a method of suppressingcondensation is proposed in which a heat insulating air layer 206 isprovided as a dual structure of the frame 200 as shown by the dot-dashline, to maintain the inner walls of the frame 200 at a temperaturehigher than that of the outer walls.

However, when blow molding or another highly difficult technique is usedfor integral molding of the frame 200 of this structure, costs areincreased. And when a method is employed in which the inner walls andouter walls are molded separately and combined, the increased number ofcomponents and increase in the number of assembly processes entailincreased cost.

Hence with the object of providing a breathing mask which is low in costand able to suppress condensation, the breathing mask of this embodimentis configured as follows.

A breathing mask which covers the nostrils of the user and supplieshumidified gas for breathing to the nostrils has a first member(cushion), abutting the face of the user and covering the nostrils andcomprising a first port which takes in gas for breathing, and a secondmember (frame) covering at least a portion of the first member, having arigidity greater than that of the first member, and comprising a secondport connected to a means for transport of the gas for breathing andwhich mates with the first port portion; a cavity is present between thefirst member and the second member.

Further, the breathing mask of another aspect has a first member(cushion), a butting the face of the user and covering the nostrils andcomprising a first inhaling port which takes in gas for breathing and afirst exhaling port which discharges breath, and a second member (frame)covering at least a portion of the first member, having a rigiditygreater than that of the first member, and comprising a second inhalingport connected to a means for transport of the gas for breathing andwhich mates with the first inhaling port portion, and a second exhalingport which mates with the first exhaling port portion and which isconnected to the outside; a cavity is present between the first memberand the second member.

Further, the breathing mask of a separate aspect has a first member(cushion), abutting the face of the user and covering the nostrils andcomprising a first port which takes in gas for breathing, and a secondmember (frame) covering at least a portion of the first member, having arigidity greater than that of the first member, and comprising a secondport connected to a means for transport of the gas for breathing andwhich mates with the first port portion; the first member has waterrepellent properties.

Moreover, the breathing mask of a separate aspect has a first member(cushion) a butting the face of the user and covering the nostrils andcomprising a first inhaling port which takes in gas for breathing and afirst exhaling port which discharges breath, and a second member (frame)covering at least a portion of the first member, having a rigiditygreater than that of the first member, and comprising a second inhalingport connected to a means for transport of the gas for breathing andwhich mates with the first inhaling port portion, and a second exhalingport which mates with the first exhaling port portion and is connectedto the outside; the first member is characterized in having waterrepellent properties. In a preferred embodiment, the first inhaling portalso serves as the first exhaling port, and the second inhaling portalso serves as the second exhaling port.

Next, the breathing mask of this embodiment is explained in detail,referring to FIG. 25 through FIG. 33.

FIG. 25 is a drawing for explaining the structure of the frame in thisembodiment. FIG. 25A is a front perspective view of the frame, and FIG.25B and FIG. 25C show rear perspective views. FIG. 26 shows enlargedviews of different portions of the frame.

The frame 20 in this embodiment has an opening portion 24 which opposesthe user, and an inhale/exhale port 22 which supplies gas for breathingand which discharges breath. The tip of the inhale/exhale port 22 isbent into an L shape, forming an L-shape tube 28. And, as shown in FIG.26A, the tip end of the L-shape tube 28 is configured to enable matingwith a flexible hose 4 b. Exhaling holes 21 are provided at places inthe inner wall of the L-shape tube 28 opposing the inhale/exhale port22. By this means, the breath of the user is discharged to the outsideof the frame 20. The flexible hose 4 b and L-shape tube 28 form a meansfor transport of gas for breathing.

A concave mating groove 26 is provided in the inner wall of the rim ofthe opening portion 24, and is configured to enable mating with thecushion 30, as described below. And, as shown in enlargement in FIG.26B, on both side portions of the frame 20 are provided mating portions27, which mate with the mating portions 16 a of panels 16 provided withstraps 10. By this means, the frame 20 is connected with straps 10 atboth side portions.

The frame 20 must have degree of rigidity such that deformation underexternal forces does not readily occur, and can, as one example, bemolded integrally from polycarbonate. Integral molding is a preferredembodiment from the standpoints of reducing the number of components andreducing costs.

As shown in FIG. 25C, a pair of plate-shape portions 22 a may be formedat positions (for example, the left and right edges) opposing theenvirons of the inhale/exhale port 22 of the frame 20. By this means,when mated with the inhale/exhale port of the cushion 30 as describedbelow, this can be enclosed and fixed more reliably. Here, semicircularplate-shape portions 22 a are shown as one example, but any arbitraryshape can be used, so long as enclosure of the inhale/exhale port of thecushion 30 is possible.

FIG. 27 is a drawing for explaining the structure of the cushion. FIG.27A is a front perspective view of the cushion, and FIG. 27B is a rearperspective view. Also, FIG. 28 shows cross-sections of the cushion.FIG. 28A shows a cross-section of the cushion 30 in the plane AA′ inFIG. 27A, and FIG. 28B shows a cross-section of the cushion 30 in theplane BB′ in FIG. 27A. The cushion 30 in this embodiment comprises afirst membrane (abutting portion) 31, which abuts the face of the user,an inhale/exhale port 32 which mates with the inhale/exhale port 22 ofthe frame 20, and an intermediate portion 33 which connects the abuttingportion 31 and the inhale/exhale port 32. The abutting portion 31,inhale/exhale portion 32, and intermediate member 33 form an internalspace 34, and gas for breathing is supplied to this internal space 34from the inhale/exhale port 22 of the frame 20.

A oval-shape opening portion 35 connecting to the internal space 34 isformed in substantially the center of the a butting portion 31, and thenostrils of the user face the internal space 34 with this openingportion 35 intervening. The region of contact between the abuttingportion 31 and the face of the user extends over the range, in thevertical direction of the face of the user, from the tip of the nose tothe upper lip, and in the lateral direction, between both cheeks. Hencethe abutting portion 31 makes contact only the environs of the nostrils,which are comparatively insensitive to discomfort resulting from contactand pressure by foreign objects. Consequently there is no contact of thecushion 30 with the sensitive nasal bridge or environs of the eyes, anda good field of vision can be secured, while preventing a situation inwhich itching, inflammation and similar occur due to long-term use.

Further, the abutting portion 31 is formed to be thin using a materialhaving a degree of flexibility and elasticity, as well asbiocompatibility, such as for example silicone rubber. Hence when thegas for breathing is supplied under pressure to the internal space 34,the first membrane 31 expands outward, and makes close contact with theface of the patient.

Consequently there is no leaking of the gas for breathing from betweenthe abutting portion 31 and the face of the user, and the occurrence ofstrange noises due to gas leakage as well as stimulation of the eyes andsimilar can be prevented. Further, even when the wearing tool 14 istightened to fasten the breathing mask 8 to the face of the user, thecontact pressure applied by the abutting portion 31 to the face of thepatient is relaxed, so that a satisfactory wearing sensation results.

Further, a second membrane 36 is provided integrally between theabutting portion 31 which is the first membrane and the intermediateportion 33 in the cushion 30. This second membrane 36 protrudes on theinside of the internal space 34, and moreover is formed in a ring shapealong the abutting portion 31. And, the second membrane 36, intermediateportion 33, and inhale/exhale port 32 are formed to be thick comparedwith the abutting portion 31 which is the first membrane, as shown inFIG. 28A, and have a certain degree of rigidity. Hence even when thebreathing mask 8 is placed in close contact with the face of thepatient, the shape of the cushion 30 can be maintained in a satisfactoryshape, and moreover the second membrane 36 presses the abutting portion31 from the inside, so that the force of close contact of the abuttingportion 31 with the face of the user can be further increased. Inparticular, it is preferable that the rim portion of the opening portion35 in the abutting portion 31 be formed extending to the inside of theinner rim portion of the second membrane 36. In this case, only theflexible abutting portion 31 abuts the face of the user, so that a moresatisfactory wearing sensation can be obtained. Further, by means ofthis configuration, a pocket 37 which can hold water drops is formed onthe inside of the abutting portion 31 and the second membrane 36, asdescribed in detail below.

Further, the second membrane 36, intermediate portion 33, andinhale/exhale port 32 may each be formed using different materials; butfrom the standpoint of reducing the number of components and reducingcosts, it is preferable that these be formed integrally using the samematerial as used in the abutting portion 31.

On the other hand, a convex mating edge 38, which can mate with themating groove 26 provided in the inner wall of the opening portion rimof the frame 20, is provided integrally on the outside of theintermediate portion 33 in the cushion 30.

FIG. 29 shows cross-sectional views of the state in which the frame 20and cushion 30 are mated. FIG. 29A shows the cross-section at the planeBB′ in FIG. 27A. The inhale/exhale portion 32 of the cushion 30 is matedwith the inhale/exhale portion 22 of the frame 20, and the mating edge38 of the cushion 30 is mated with the mating groove 26 of the frame 20.By this means, the frame 20 and cushion 30 are mated at two places.Further, by molding the frame 20 in advance such that the outer wall isformed in a shape which swells outward, a cavity 40 is formed betweenthe frame 20 and the cushion 30.

Through the functioning of this cavity 40 as a heat insulating airlayer, the temperature within the cushion 30 can be maintained at atemperature higher than the temperature outside the frame 20, andcondensation within the cushion 30 can be suppressed. In order toenhance the air tightness of the cavity 40, a gel or other adhesive maybe applied between the mating groove 26 on the side of the frame 20 andthe mating edge 38 on the side of the cushion 30. By this means, theheat insulation effect of the cavity 40 can be enhanced, andcondensation can be suppressed more reliably.

Further, in the above configuration the mating groove 26 on the side ofthe frame 20 and the mating edge 38 on the side of the cushion 30 can bemated and fixed, so that when the wearing tool 14 is tightened and thebreathing mask 8 is brought into close contact with the face of thepatient, pressing of the cushion 30 into the frame 20 can be prevented.Hence blocking of the cavity 40 can be prevented. Also, when the cushion30 is formed from silicone rubber or another flexible material, uponsupplying gas for breathing under pressure, the intermediate portion 33and similar expand slightly; in this case also, the mating groove 26 andmating edge 38 are mated, so that the occurrence of shifts in positionbetween the frame 20 and the cushion 30 can be prevented. And, thecontact pressure when wearing the breathing mask 8 to the user can berelaxed through the action of expansion of the a butting portion 31, andin addition, by forming the convex mating edge 38 of silicone rubber orsimilar, similarly to the other portions of the cushion 30, the matingedge 38 acts as a cushion which relaxes the pressure. Hence the wearingsensation felt by the user can be further improved.

In place of providing a concave mating groove 26 and a convex matingedge 38, the same action and advantageous results can be obtained by aconfiguration in which mutually joinable steps are provided on theperiphery or a portion of the frame 20 and cushion 30. That is, theframe 20 and cushion 30 can be joined and fixed, so that the airtightness of the cavity 40 is enhanced, and when the wearing tool 14 istightened and the breathing mask 8 is brought into close contact withthe face of the patient, pressing of the cushion 30 into the frame 20can be prevented. Hence blocking of the cavity 40 can be prevented. Evenwhen the intermediate portion 33 of the cushion 30 expands due to thepressurized gas for breathing, shifts in position between the frame 20and cushion 30 can be prevented. Further, by joining the cushion 30 withthe frame 20, it acts as a cushion which relaxes pressure, and thewearing sensation felt by the user can be further improved.

As shown in FIG. 29B, a protrusion 30 p to discriminate between theright and left of the cushion 30 can be provided, so that right and leftare discriminated according to the presence or absence of a protrusion,and the number thereof. Or, as the means of discrimination, characters,symbols, or figures may be provided apart from protrusions. By thismeans, right and left can easily be discriminated when connecting thecushion 30 and the frame 20. Hence when the breathing mask 8 isdisassembled and cleaned, and the user once again assembles the mask,assistance can be provided for efficient and accurate assembly.

Here, the advantageous results of this embodiment are explained, throughcomparison with an example of the prior art. First, in the prior artexample shown in FIG. 24, the frame 200 and cushion 300 are configuredas separate members formed from different materials, and in a breathingmask 8 employing these in combination, a heat insulating air layer isformed by employing a dual structure for the frame 200. On the otherhand, in this embodiment shown in FIG. 25 through FIG. 29, the frame 20and cushion 30 are configured as separate members formed using differentmaterials, and a cavity 40 can be formed as a heat insulating air layerwhen these are used in combination, so that condensation can besuppressed using a smaller number of components and fewer manufacturingprocesses.

Further, in the above configuration, the entire inner walls of thebreathing mask 8 are formed by the cushion 30, so that the waterrepellent properties of silicone rubber can be applied to the entiretyof the inner walls. Hence even when small-diameter water drops occur dueto condensation within the cushion 30, because of the small adsorptiveforce with the cushion 30, the drops can be discharged to the outside bythe airflows of the gas for breathing supplied to the mask, the breathof the patient, and similar before the drops grow to a large enoughdiameter to drip onto the face of the user, and so dripping of waterdrops onto the face of the user can be prevented. And, because exhalingholes 21 are provided near the inhale/exhale port 32, that is, near theinhale/exhale port 22 on the side of the frame 20, discharge of moistair can be promoted. Hence the more rapid evaporation of water drops canbe promoted.

Here, if when the user is lying on the back there are scattered placesabove the environs of the nostrils which do not have water repellentproperties, then there is an increased probability that water dropswhich have condensed at these places will grow and drip onto the face ofthe user. By employing the above configuration, the inner walls of thecushion 30 having water repellent properties, the inhale/exhale port 32,the inhale/exhale port 22 of the frame 20, and the inner wall portionsof the L-shape tube 28 in which the exhaling holes 21 are provided, arepositioned vertically above the environs of the nostrils of the userlying on the back. Here, the inner walls of the L-shape tube 28 do nothave water repellent properties, but by providing the exhaling holes 21,the probability of occurrence of condensation at such places, or theprobability of growth to a large diameter of water drops which havecondensed, can be made small. In this way, even should condensationoccur on the inner walls of the cushion 30, the water drops can bedischarged to the outside from the exhaling holes 21 via theinhale/exhale ports 32, 22 by the airflows of the gas for breathingsupplied to the mask, by the breath of the patient, and similar, beforegrowing to large diameter. Hence the probability that water drops abovethe environs of the nostrils of the user will grow is made small, andwakening due to dripping of water drops can be prevented.

Further, in order to enhance the closeness of contact at the environs ofthe nostrils of the user, the abutting portion 31 is curved in thelateral direction overall, and is formed with the rim portion of theopening portion 35 in the abutting portion 31 extending to the insidefrom the inner rim portion of the second membrane 36, so that when wornwith the user lying on the back, even if condensed water drops travelalong the inner walls of the cushion 30 and fall, a pocket 37 capable ofholding the water drops is formed on the inside of the abutting portion31 and in the second membrane 36. And, by making the shape of theabutting portion 31 a shape which is curved in the lateral direction,the pocket 37 has a shape which broadens downwards, so that theaccumulated water drops can be held reliably. It is preferable that asponge, absorbent gel, or other water-absorbing material be comprised inthe pocket 37, so that water drops can be held with high certainty.Hence falling of water drops onto the face of the user and wakening ofthe user can be prevented with higher certainty.

As another embodiment, the frame 20 and the cushion 30 may have separateinhaling ports and exhaling ports.

FIG. 30 shows an example of the configuration of a frame 20 and cushion30 having separate inhaling ports and exhaling ports. In thisconfiguration, the inhaling port 32 a and exhaling port 32 b of thecushion 30 are provided so as to enable mating with the inhaling port 22a and exhaling port 22 b of the frame 20, respectively. And, theexhaling port 32 b portion of the cushion 30 is formed from siliconerubber having water repellent properties similar to the entire cushion30. Hence even should condensation occur within the cushion 30,evaporation will be caused before growing into water drops large enoughto fall, and moist air can be discharged outside the mask from theexhaling port 32 b. Hence falling of condensed water drops and wakeningof the user can be prevented.

Here, a case is shown in which two exhaling ports 22 b, 32 b areprovided, but the number and placement of exhaling ports are not limitedto those of this example.

Further, in this case also, by forming a cavity 40 between the frame 20and the cushion 30 as a heat insulating air layer, the advantageousresult described above of suppressing condensation can be obtained.

[6] Second Embodiment of Breathing Mask

In a second embodiment of a breathing mask, by integrally molding andproviding the L-shape tube 28 on the frame 20, the number of componentsof the breathing mask 8 and costs can be reduced. And, the matingportions of the frame 20 and cushion 30, that is, the inhale/exhaleports 22, 32, mating groove 26, and mating edge 38, are formed in shapeshaving 180° rotational symmetry. Together with this, the portions 27mating with the panels 16 provided on the frame 20 and straps 10 areformed in shapes having 180° rotational symmetry. By this means, thebreathing mask 8 can be configured such that the direction of the tipportion of the L-shape tube 28 may be directed to the left or to theright, according to the preference of the user, and can be worn by thewearing tool 14. By this means, the breathing mask 8 can be worn withthe flexible hose 4 b directed in advance in the direction in whichthere is little concern that, when the user is lying on the side, theflexible hose 4 b will be crushed by the body. Hence crushing of theflexible hose 4 b and hindrance of the supply of gas for breathing canbe prevented.

FIG. 31 is a drawing for explaining examples of the shapes of the matingportions of the frame 20 and cushion 30. The examples of shapes shown inFIG. 31 are examples of shapes of the inhale/exhale port 22 of the frame20 and inhale/exhale port 32 of the cushion 30, or examples of shapes ofthe mating groove 26 of the frame 20 and the mating edge 38 of thecushion 30. The examples shown in FIG. 25 through FIG. 29 correspond tothe elliptical shape in FIG. 31A. In addition, for example a diamondshape (FIG. 31B), rectangular shape (FIG. 31C), or other irregularshapes (FIG. 31D), or any other arbitrary shapes having 180° rotationalsymmetry, can be used. Here a true circle, a square shape, and othershapes with 90° rotational symmetry are also included; but if a shapewith 90° rotational symmetry is used, then mating is also possible withthe lateral directions of the frame 20 and the cushion 30 rotated by90°, and so in order to prevent such errors in assembly, shapes with180° rotational symmetry are preferred.

Further, the shapes of the inhale/exhale port 22 and mating groove 26 onthe side of the frame 20, and of the inhale/exhale port 32 and matingedge 38 on the side of the cushion 30, may respectively be the sameshapes, or may be different shapes. By means of this configuration, whenthe user assembles the breathing mask 8, the direction of the L-shapetube 28 can be directed to either the left or to the right, so thatfreedom of selection is secured, and in addition no errors are made inthe vertical direction. Hence accurate assembly can be performed.

Thus by means of this embodiment, freedom in the direction of connectionof the frame 20 and flexible hose 4 b can be secured at low cost, andconvenience to the user can be enhanced.

Further, an embodiment in which the shapes of the mating portions of theframe and cushion have 180° rotational symmetry as described above canalso be applied to a breathing mask configured with a conventional frameand cushion, as shown in FIG. 32. Here, in contrast with the case ofFIG. 24, the inhaling port 203 forms an L-shape tube directed in alateral direction.

In this case, in a breathing mask 8 having a frame 200 forming the shellof the breathing mask and a cushion 300 provided on the rim of theopening portion 204 of the frame 200 and which abuts the environs of thenostrils of the user, the frame 200 and cushion 300 are configured toenable attachment and removal. For example, the rim of the openingportion of the frame 200 and the cushion 300 are configured to enablemating. Here, by making the shapes of the mating portions of the rim ofthe opening portion of the frame 200 and the cushion 300 shapes with180° rotational symmetry as described above, the direction of connectionof the inhaling port 203 forming the L-shape tube can be either to theright or to the left. That is, freedom in the direction of connection ofthe frame 20 and the flexible hose 4 b can be secured, and accurateassembly is made possible. Hence convenience to the user can beenhanced.

FIG. 33 is a drawing for explaining a practical example relating to thecombination of the mating portion 27 of the frame 20 and the matingportion 16 a of the panel 16. In FIG. 33A, a schematic plane view of theframe 20 and the left and right panels 16 is shown. For convenience,here the right and left in the plane of the paper are associated withthe right and left of the frame 20 and panels 16 in the explanation.Also, here a case is explained in which the mating portions 16 a on thesides of the panels 16 have a columnar shape, whereas the matingportions 27 on the side of the frame 20 have a groove shape (shown insolid black) which mate therewith; but the mating portions 16 a and 27may have the opposite shapes.

In this practical example, the mating portions 27 of the frame 20 andthe mating portions 16 a of the panels 16 have 180° rotational symmetry,and vertically are not symmetric. For example, a configuration isemployed in which a cone-shape portion 16 r is provided on the upper endof the mating portion 16 a on the left side, and a cone-shape portion 16r′ is provided on the lower end of the mating portion 16 a on the rightside, and the mating portions 27 have shapes corresponding thereto.

By means of this configuration, first the mating portions 27 of theframe 20 and the mating portions 16 a of the panels 16 have 180°rotational symmetry, so that when the entire frame 20 is rotated tochange the direction of the L-shape tube 28, either of the matingportions 27 can be mated with the mating portions 16 a of the left andright panels 16. However, if an attempt is made to erroneously mount theframe 20 and panels 16 with the front and rear reversed, the matingshapes of the mating portions 27 and 16 a do not match, so that assemblyis not possible. If the panels 16 are assembled with the front and rearerroneous, the panels 16 abut the cheeks of the user, and there is theconcern that discomfort may occur; but by means of this practicalexample, such a situation can be prevented. Further, when marks areprovided to indicate front and rear, the user must confirm the markseach time. However, by means of this practical example, erroneousassembly is not possible, so that errors in assembly can easily beprevented.

FIG. 33B through FIG. 33E show other modified examples. For convenience,in FIG. 33B through FIG. 33E only the left-side mating portions 16 a and27 are shown. FIG. 33B is an example in which, in place of cone shapes,portions 16 s with a hemispherical shape are provided at the upper endsof the mating portions 27, 16 a. FIG. 33C is an example in which adisc-shape portion 16 t is provided at a position toward the upper endfrom the center of the mating portion 16 a, and an opening correspondingthereto is provided in the mating portion 27. FIG. 33D is an example inwhich the mating portions 27 and 16 a are divided into upper and lower,and the upper and lower lengths are made different. FIG. 33E is anexample in which a flange-shaped convex portion 16 u is provided in thedirection perpendicular to a columnar groove in the upper end of themating portion 27, and an opening corresponding thereto is provided onthe side of the mating portion 16 a.

A breathing mask 8 having the frame 20 and cushion 30 of the first andsecond embodiments of breathing masks may be used with the wearing tool14 in the first through fourth embodiments of wearing tool describedabove, or may be used with wearing tool other than the wearing tool 14,such as for example a conventional headgear-type wearing tool. In allthese cases, a breathing mask which suppresses condensation on theinside can be realized at low cost. Further, even if condensationoccurs, falling of water drops resulting from condensation onto the faceof a user while asleep to cause wakening can be prevented. Further, abreathing mask can be realized at low cost which can prevent a situationin which, because the user is lying on the side, the flexible hose 4 bis crushed by the body, impeding the flow of gas for breathing.

Further, the wearing tool 14 in the first through fourth embodiments ofwearing tool described above can be used not only in CPAP treatment forsleep apnea syndrome, but also in other applications. For example, useas the wearing tool of an oxygen mask for first aid procedures inemergencies is possible. In this case, wearing can be performed morequickly and more easily than in the case of headgear designs which latcharound the perimeter of the head of the user. Or, the wearing tool 14 inthe first through fourth embodiments of wearing tool, and the breathingmasks 8 in the first and second embodiments of breathing masks, can alsobe applied to NIPPV (Non-invasive Positive Pressure Ventilation)treatment, which is one ventilatory failure treatment method in which agas for breathing, pressurized to approximately 392 to 1961 Pa, issupplied intermittently to the environs of the nostrils of the user. Inthe NIPPV treatment method, the user must fasten a breathing mask notonly while sleeping, but during the daytime as well. Hence the wearingtool 14 of the first through fourth embodiments of wearing tool, and thebreathing masks 8 of the first and second embodiments of breathingmasks, are suitable for use to reduce the pain and discomfort attendingprolonged wearing of the breathing mask, and to suppress condensationand prevent the growth of water drops.

As explained above, by the present invention, the breathing mask can befixed at the environs of the nostrils of the user, and together withthis, a pain and a discomfort feeling brought by wearing can be reduced.Also, displacement of the breathing mask can be prevented. Further, bythe present invention, when the breathing mask is worn, adjustmentaccording to the structure of the nose of the user is enabled, andwearing of the breathing mask is facilitated. Further, by the presentinvention, condensation of the breathing mask can be suppressed at lowcost. And, by the present invention, the breathing mask which canprevent interference with the supply of gas for breathing is realized atlow cost.

DESCRIPTION OF NOTES

2: BREATHING GAS SUPPLY APPARATUS 4 a, 4 b: FLEXIBLE HOSE6: HUMIDIFIER8:BREATHING MASK10: STRAP 12: PLUG13: EAR HOOKING PORTION13 a: FRAMEPORTION 13 b: BIASING PORTION14: WEARING TOOL16: PANEL160 a, 160 b:PLATE-SHAPE MEMBER20: FRAME21: EXHALING HOLES 22: INHALE/EXHALE PORT24:OPENING PORTION26: MATING GROOBE 28: L-SHAPE TUBE30: CUSHON31: ABUTINGPORTION32: INHALE/EXHALE PORT35: OPENING PORTION37: POCKET 38: MATINGEDGE

What is claimed is:
 1. A breathing mask which covers the nostrils of theuser and supplies humidified gas for breathing to the nostrilscomprising: a first member which abuts the face of a user and covers thenostrils and comprises a first port which takes in gas for breathing;and a second member having a rigidity greater than that of the firstmember, which covers at least a portion of the first member andcomprises a second port connected to a means for transport of the gasfor breathing and which mates with the first port portion; wherein acavity is present between the first member and the second member.
 2. Abreathing mask which covers the nostrils of the user and supplieshumidified gas for breathing to the nostrils comprising: a first member,abutting the face of the user and covering the nostrils, which comprisesa first inhaling port which takes in gas for breathing and a firstexhaling port which discharges breath; and a second member, having arigidity greater than that of the first member, which covers at least aportion of the first member and comprises a second inhaling portconnected to a means for transport of the gas for breathing and whichmates with the first inhaling port portion, and a second exhaling portwhich mates with the first exhaling port portion and which is connectedto the outside; wherein a cavity is present between the first member andthe second member.
 3. The breathing mask according to claim 1, whereinthe first member and the second member seal the cavity by mating orlatching with each other.
 4. A breathing mask which covers the nostrilsof the user and supplies humidified gas for breathing to the nostrilscomprising: a first member which abuts the face of a user and covers thenostrils and comprises a first port which takes in gas for breathing;and a second member having a rigidity greater than that of the firstmember, which covers at least a portion of the first member andcomprises a second port connected to a means for transport of the gasfor breathing and which mates with the first port portion; wherein thefirst member has water repellent properties.
 5. A breathing mask whichcovers the nostrils of the user and supplies humidified gas forbreathing to the nostrils comprising: a first member, abutting the faceof the user and covering the nostrils, which comprises a first inhalingport which takes in gas for breathing and a first exhaling port whichdischarges breath; and a second member, having a rigidity greater thanthat of the first member, which covers at least a portion of the firstmember and comprises a second inhaling port connected to a means fortransport of the gas for breathing and which mates with the firstinhaling port portion, and a second exhaling port which mates with thefirst exhaling port portion and which is connected to the outside;wherein the first member has water repellent properties.
 6. Thebreathing mask according to claim 2, wherein the first inhaling portserves as the first exhaling port, and the second inhaling port servesas the second exhaling port.
 7. The breathing mask according to claim 4,wherein the first member has a pocket, on the rim portion of the innerwalls, which holds a water drop.
 8. The breathing mask according toclaim 7, wherein the pocket has inside a water-absorbing material.
 9. Abreathing mask which covers the nostrils of a user and supplies gas forbreathing to the nostrils comprising: a first member which abuts theface of the user and covers the nostrils; and a second member, havinggreater rigidity than that of the first member, which is connected withthe first member by connecting, at a prescribed position, with atransporting means of the gas for breathing; wherein portions of thefirst member and the second member for connecting each other have 180degree rotational symmetry shapes.
 10. The breathing mask according toclaim 9, whereby the second member is connected by the both sides with apair of wearing tools, and the both sides of the second member andconnecting portions of the pair of wearing tools have shapes which havevertically asymmetry shapes, and one of which, when rotated by 180degrees, is the same shape as the other.